UI Test Automation (#39777)

### Summary

This pull request includes the following updates:

1. Improvements and stabilization of the UI automation framework  
2. Setup of the UI automation pipeline  
3. Add UI test cases for FancyZones  
4. Add UI test cases for MouseUtils  
5. Improvements of Hosts Editor UI tests

---

### Related Links

- **Current Release checklist coverage**:  
 
https://github.com/microsoft/PowerToys/blob/feature/UITestAutomation/src/common/UITestAutomation/Doc/ui-automation-cover-list.md

- **UI Automation pipeline**:  
 
https://microsoft.visualstudio.com/Dart/_build?definitionId=161438&_a=summary

---------

Signed-off-by: Shawn Yuan <shuai.yuan.zju@gmail.com>
Signed-off-by: Shawn Yuan <shuaiyuan@microsoft.com>
Co-authored-by: Jerry Xu <n.xu@outlook.com>
Co-authored-by: Zhaopeng Wang <zhaopengwang@microsoft.com>
Co-authored-by: Xiaofeng Wang (from Dev Box) <xiaofengwang@microsoft.com>
Co-authored-by: Mengyuan <162882040+chenmy77@users.noreply.github.com>
Co-authored-by: yaqingmi <miyaqing01@gmail.com>
Co-authored-by: Clint Rutkas <clint@rutkas.com>
Co-authored-by: Yaqing Mi (from Dev Box) <yaqingmi@microsoft.com>
Co-authored-by: Kai Tao <69313318+vanzue@users.noreply.github.com>
Co-authored-by: zhaopeng wang <33367956+wang563681252@users.noreply.github.com>
Co-authored-by: Laszlo Nemeth <57342539+donlaci@users.noreply.github.com>
Co-authored-by: RokyZevon <12629919+RokyZevon@users.noreply.github.com>
Co-authored-by: Yu Leng <42196638+moooyo@users.noreply.github.com>
Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com>
Co-authored-by: Davide Giacometti <25966642+davidegiacometti@users.noreply.github.com>
Co-authored-by: Gordon Lam <73506701+yeelam-gordon@users.noreply.github.com>
Co-authored-by: ruslanlap <106077551+ruslanlap@users.noreply.github.com>
Co-authored-by: Muhammad Danish <mdanishkhdev@gmail.com>
Co-authored-by: Bennett Blodinger <benwa@users.noreply.github.com>
Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>
Co-authored-by: Ionuț Manța <ionut@janeasystems.com>
Co-authored-by: Hao Liu <liuhaobupt@163.com>
Co-authored-by: OlegHarchevkin <40352094+OlegKharchevkin@users.noreply.github.com>
Co-authored-by: dcog989 <89043002+dcog989@users.noreply.github.com>
Co-authored-by: PesBandi <127593627+PesBandi@users.noreply.github.com>
Co-authored-by: Stefan Markovic <57057282+stefansjfw@users.noreply.github.com>
Co-authored-by: vanzue <vanzue@outlook.com>
Co-authored-by: Typpi <20943337+Nick2bad4u@users.noreply.github.com>
Co-authored-by: Mike Griese <migrie@microsoft.com>
Co-authored-by: Carlos Zamora <carlos.zamora@microsoft.com>
Co-authored-by: Abhyudit <64366765+bitmap4@users.noreply.github.com>
Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>
Co-authored-by: Ved Nig <vednig12@outlook.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>
Co-authored-by: Aung Khaing Khant <aungkhaingkhant.dev@gmail.com>
Co-authored-by: Aung Khaing Khant <aungkhaingkhant@advent-soft.com>
Co-authored-by: Dustin L. Howett <duhowett@microsoft.com>
Co-authored-by: leileizhang <leilzh@microsoft.com>
Co-authored-by: Dustin L. Howett <dustin@howett.net>
Co-authored-by: Shawn Yuan <128874481+shuaiyuanxx@users.noreply.github.com>
Co-authored-by: Shawn Yuan <shuai.yuan.zju@gmail.com>
Co-authored-by: cryolithic <cryolithic@gmail.com>
Co-authored-by: Lemonyte <49930425+lemonyte@users.noreply.github.com>
Co-authored-by: Gordon Lam (SH) <yeelam@microsoft.com>
Co-authored-by: Corey Hayward <72159232+CoreyHayward@users.noreply.github.com>
Co-authored-by: Jerry Xu <nxu@microsoft.com>
Co-authored-by: Shawn Yuan <shuaiyuan@microsoft.com>
Co-authored-by: Kayla Cinnamon <cinnamon@microsoft.com>
Co-authored-by: Jeremy Sinclair <4016293+snickler@users.noreply.github.com>

doc/devdocs/UITests.md

@@ -21,67 +21,74 @@
 
 - Create a new project and add the following references to the project file. Change the OutputPath to your own module's path.
   ```
-  	<PropertyGroup>
-  		<OutputType>Library</OutputType>
-  		<!-- This is a UI test, so don't run as part of MSBuild -->
-  		<RunVSTest>false</RunVSTest>
-  	</PropertyGroup>
-  
-  	<PropertyGroup>
-  		<OutputPath>..\..\..\..\$(Platform)\$(Configuration)\tests\KeyboardManagerUITests\</OutputPath>
-  	</PropertyGroup>
-  
-  	<ItemGroup>
-  	    <PackageReference Include="MSTest" />
-  	    <ProjectReference Include="..\..\..\common\UITestAutomation\UITestAutomation.csproj" />
-  	    <Folder Include="Properties\" />
-	</ItemGroup>
+    <Project Sdk="Microsoft.NET.Sdk">
+    <!-- Look at Directory.Build.props in root for common stuff as well -->
+    <Import Project="..\..\..\Common.Dotnet.CsWinRT.props" />
+
+    <PropertyGroup>
+        <ProjectGuid>{4E0AE3A4-2EE0-44D7-A2D0-8769977254A0}</ProjectGuid>
+        <RootNamespace>PowerToys.Hosts.UITests</RootNamespace>
+        <AssemblyName>PowerToys.Hosts.UITests</AssemblyName>
+        <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
+        <Nullable>enable</Nullable>
+        <OutputType>Library</OutputType>
+
+        <!-- This is a UI test, so don't run as part of MSBuild -->
+        <RunVSTest>false</RunVSTest>
+        </PropertyGroup>
+        <PropertyGroup>
+        <OutputPath>$(SolutionDir)$(Platform)\$(Configuration)\tests\Hosts.UITests\</OutputPath>
+        </PropertyGroup>
+
+        <ItemGroup>
+        <PackageReference Include="MSTest" />
+        <ProjectReference Include="..\..\..\common\UITestAutomation\UITestAutomation.csproj" />
+        </ItemGroup>
+    </Project>
+
   ```
 - Inherit your test class from UITestBase.
   >Set Scope: The default scope starts from the PowerToys settings UI. If you want to start from your own module, set the constructor as shown below:
   
   >Specify Scope:
   ```
-  [TestClass]
-  public class RunFancyZonesTest : UITestBase
-  {
-      public RunFancyZonesTest()
-          : base(PowerToysModule.FancyZone)
-      {
-      }
-  }
+    [TestClass]
+    public class HostModuleTests : UITestBase
+    {
+        public HostModuleTests()
+            : base(PowerToysModule.Hosts, WindowSize.Small_Vertical)
+        {
+        }
+    }
   ```
 
-- Then you can start using session to perform the UI operations.
+- Then you can start performing the UI operations.
 
 **Example**
 ```
-using Microsoft.PowerToys.UITest;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-namespace UITests_KeyboardManager
+[TestMethod("Hosts.Basic.EmptyViewShouldWork")]
+[TestCategory("Hosts File Editor #4")]
+public void TestEmptyView()
 {
-    [TestClass]
-    public class RunKeyboardManagerUITests : UITestBase
-    {
-        [TestMethod]
-        public void OpenKeyboardManagerEditor()
-        {
-            // Open KeyboardManagerEditor
-            this.Session.Find<Button>(By.Name("Remap a key")).Click();
-            this.Session.Attach("Remap keys");
+    this.CloseWarningDialog();
+    this.RemoveAllEntries();
 
-            // Maximize window
-            var window = Session.Find<Window>(By.Name("Remap keys")).Maximize();
+    // 'Add an entry' button (only show-up when list is empty) should be visible
+    Assert.IsTrue(this.HasOne<HyperlinkButton>("Add an entry"), "'Add an entry' button should be visible in the empty view");
 
-            // Add Key Remapping
-            this.Session.Find<Button>(By.Name("Add key remapping")).Click();
-            window.Close();
+    VisualAssert.AreEqual(this.TestContext, this.Find("Entries"), "EmptyView");
 
-            // Back to Settings
-            this.Session.Attach(PowerToysModule.PowerToysSettings);
-        }
-    }
+    // Click 'Add an entry' from empty-view for adding Host override rule
+    this.Find<HyperlinkButton>("Add an entry").Click();
+
+    this.AddEntry("192.168.0.1", "localhost", false, false);
+
+    // Should have one row now and not more empty view
+    Assert.IsTrue(this.Has<Button>("Delete"), "Should have one row now");
+    Assert.IsFalse(this.Has<HyperlinkButton>("Add an entry"), "'Add an entry' button should be invisible if not empty view");
+
+    VisualAssert.AreEqual(this.TestContext, this.Find("Entries"), "NonEmptyView");
 }
 ```