Fail Deprecated Xamarin Test Cloud Task (#19474)

* Fail Deprecated Xamarin Test Cloud Task

* commit changes to fix test

* change feature flag retrieve code

* bump task version

Author: Pranshu-Negi

Tasks/XamarinTestCloudV1/Strings/resources.resjson/en-US/resources.resjson

@@ -28,5 +28,6 @@
   "loc.input.label.optionalArgs": "Optional arguments",
   "loc.input.help.optionalArgs": "Additional arguments passed to test-cloud.exe.",
   "loc.input.label.publishNUnitResults": "Publish results to Azure Pipelines",
-  "loc.input.help.publishNUnitResults": "When selected, --nunit-xml option will be passed to test-cloud.exe. Results from the NUnit xml file will be published to Azure Pipelines."
+  "loc.input.help.publishNUnitResults": "When selected, --nunit-xml option will be passed to test-cloud.exe. Results from the NUnit xml file will be published to Azure Pipelines.",
+  "loc.messages.DeprecatedTask": "The XamarinTestCloud@1 (Xamarin Test Cloud) task has been deprecated since January 11, 2018 and will soon be retired. Use the AppCenterDistribute@3 task instead."
 }

Tasks/XamarinTestCloudV1/XamarinTestCloud.ps1

@@ -193,4 +193,11 @@ if($testCloudResults)
     Write-Host "##vso[task.addattachment type=Distributedtask.Core.Summary;name=Xamarin Test Cloud Results;]$mdReportFile"
 }
 
+$featureFlags = @{
+    failDeprecatedBuildTask  = [System.Convert]::ToBoolean($env:FAIL_DEPRECATED_BUILD_TASK)
+}
+if ($featureFlags.failDeprecatedBuildTask)
+{
+	throw "The XamarinTestCloud@1 (Xamarin Test Cloud) task has been deprecated since January 11, 2018 and will soon be retired. Use the AppCenterDistribute@3 task instead."
+}
 Write-Verbose "Leaving script XamarinTestCloud.ps1"