[ci]Fix running xaml styles in CI (#35426)

XAML style checkers aren't running right now in PR CI. This allowed some XAML style errors to cause build errors in release CI.

This PR contains the following fixes:
- Fix XAML style of files that have slipped.
- Add errors to the scripts that depend on dotnet commands if it fails.
- Add .NET 6 on CI so that applyXamlStyling.ps1 and verifyNugetPackages.ps1 run correctly again.

.pipelines/applyXamlStyling.ps1

@@ -117,7 +117,10 @@ else
         {
             Write-Error 'XAML Styling is incorrect, please run `.\.pipelines\applyXamlStyling.ps1 -Main` locally.'
         }
-
+        if ($lastExitCode -lt 0)
+        {
+            Write-Error "Error running dotnet tool run, with the exit code $lastExitCode. Please verify logs and running environment."
+        }
         # Return XAML Styler Status
         exit $lastExitCode
     }

.pipelines/v2/templates/job-build-project.yml

@@ -127,12 +127,10 @@ jobs:
         Write-Host "##vso[task.setvariable variable=MSBuildCacheParameters]$MSBuildCacheParameters"
       displayName: Prepare MSBuildCache variables
 
-  - ${{ if eq(parameters.codeSign, true) }}:
-    # Only required if we're using ESRP
-    - template: steps-ensure-dotnet-version.yml
-      parameters:
-        sdk: true
-        version: '6.0'
+  - template: steps-ensure-dotnet-version.yml
+    parameters:
+      sdk: true
+      version: '6.0'
 
   - template: steps-ensure-dotnet-version.yml
     parameters:

.pipelines/verifyNugetPackages.ps1

@@ -8,6 +8,12 @@ Write-Host "Verifying Nuget packages for $solution"
 
 dotnet tool restore
 dotnet consolidate -s $solution
+if ($lastExitCode -ne 0)
+{
+    $result = $lastExitCode
+    Write-Error "Error running dotnet consolidate, with the exit code $lastExitCode. Please verify logs and running environment."
+    exit $result
+}
 
 if (-not $?)
 {