Temporarily disable Windows ARM test executions (#32390)

The new Windows.10.Arm64v8.Open queue exhibits flaky behavior
that is currently failing in most of our PR runs. Disabling test
execution on ARM before this is fixed.

Thanks

Tomas

eng/pipelines/coreclr/templates/helix-queues-setup.yml

@@ -116,8 +116,9 @@ jobs:
 
     # Windows_NT arm
     - ${{ if eq(parameters.platform, 'Windows_NT_arm') }}:
-      - ${{ if and(eq(variables['System.TeamProject'], 'public'), in(parameters.jobParameters.helixQueueGroup, 'pr', 'ci', 'libraries')) }}:
-        - Windows.10.Arm64v8.Open
+      # Currently blocked by https://github.com/dotnet/runtime/issues/32320
+      # - ${{ if and(eq(variables['System.TeamProject'], 'public'), in(parameters.jobParameters.helixQueueGroup, 'pr', 'ci', 'libraries')) }}:
+      #   - Windows.10.Arm64v8.Open
       - ${{ if eq(variables['System.TeamProject'], 'internal') }}:
         - Windows.10.Arm64