Add New CI Pipeline for Latest WindowsAppSDK (#36282)

This PR introduces the following changes to the CI pipeline and version management:

Pipeline Enhancements:
1. Added a new script UpdateVersions.ps1 to automate the update of Microsoft.WindowsAppSDK versions across various project files.
2. Introduced a new pipeline configuration ci-using-the-latest-winappsdk.yml to build using the latest Microsoft.WindowsAppSDK.
3. Updated existing pipeline configurations to support the new useLatestWinAppSDK parameter.

Pipeline Configuration Updates:
1. Updated job-build-project.yml to handle the useLatestWinAppSDK parameter and adjust the RestoreAdditionalProjectSourcesArg accordingly.
2. Added a new template steps-update-winappsdk-and-restore-nuget.yml for updating and restoring NuGet packages with the latest Microsoft.WindowsAppSDK.
3. Added WinAPPSDK version selection, the pipeline can be manually triggered to use the specified version.

---------

Signed-off-by: Shawn Yuan <shuai.yuan.zju@gmail.com>
Co-authored-by: Clint Rutkas <clint@rutkas.com>

.pipelines/v2/ci-using-the-latest-winappsdk.yml

@@ -0,0 +1,50 @@
+trigger: none
+pr: none
+schedules:
+  - cron: "0 0 * * *" # every day at midnight
+    displayName: "Daily midnight Build"
+    branches:
+      include:
+        - main
+    always: false # only run if there's code changes!
+
+name: $(BuildDefinitionName)_$(date:yyMM).$(date:dd)$(rev:rrr)
+
+parameters:
+  - name: buildPlatforms
+    type: object
+    default:
+      - x64
+      - arm64
+  - name: enableMsBuildCaching
+    type: boolean
+    displayName: "Enable MSBuild Caching"
+    default: false
+  - name: runTests
+    type: boolean
+    displayName: "Run Tests"
+    default: true
+  - name: useVSPreview
+    type: boolean
+    displayName: "Build Using Visual Studio Preview"
+    default: false
+  - name: useLatestWinAppSDK
+    type: boolean
+    default: true
+  - name: winAppSDKVersionNumber
+    type: string
+    default: 1.6
+  - name: useExperimentalVersion
+    type: boolean
+    default: false
+
+extends:
+  template: templates/pipeline-ci-build.yml
+  parameters:
+    buildPlatforms: ${{ parameters.buildPlatforms }}
+    enableMsBuildCaching: ${{ parameters.enableMsBuildCaching }}
+    runTests: ${{ parameters.runTests }}
+    useVSPreview: ${{ parameters.useVSPreview }}
+    useLatestWinAppSDK: ${{ parameters.useLatestWinAppSDK }}
+    winAppSDKVersionNumber: ${{ parameters.winAppSDKVersionNumber }}
+    useExperimentalVersion: ${{ parameters.useExperimentalVersion }}