Update dependencies from https://github.com/dotnet/arcade build 20201204.2 (#9197)

[master] Update dependencies from dotnet/arcade
- Coherency Updates:
  - Microsoft.SourceLink.GitHub: from 1.1.0-beta-20566-02 to 1.1.0-beta-20580-02 (parent: Microsoft.DotNet.Arcade.Sdk)
  - XliffTasks: from 1.0.0-beta.20568.1 to 1.0.0-beta.20574.1 (parent: Microsoft.DotNet.Arcade.Sdk)

eng/common/tools.ps1

@@ -677,14 +677,23 @@ function MSBuild-Core() {
   $exitCode = Exec-Process $buildTool.Path $cmdArgs
 
   if ($exitCode -ne 0) {
-    Write-PipelineTelemetryError -Category 'Build' -Message 'Build failed.'
+    # We should not Write-PipelineTaskError here because that message shows up in the build summary
+    # The build already logged an error, that's the reason it failed. Producing an error here only adds noise.
+    Write-Host "Build failed with exit code $exitCode. Check errors above." -ForegroundColor Red
 
     $buildLog = GetMSBuildBinaryLogCommandLineArgument $args
-    if ($buildLog -ne $null) {
+    if ($null -ne $buildLog) {
       Write-Host "See log: $buildLog" -ForegroundColor DarkGray
     }
 
-    ExitWithExitCode $exitCode
+    if ($ci) {
+      Write-PipelineSetResult -Result "Failed" -Message "msbuild execution failed."
+      # Exiting with an exit code causes the azure pipelines task to log yet another "noise" error
+      # The above Write-PipelineSetResult will cause the task to be marked as failure without adding yet another error
+      ExitWithExitCode 0
+    } else {
+      ExitWithExitCode $exitCode
+    }
   }
 }