Check for ghstack PRs

Workflow runs for Check for ghstack PRs

• Add ghstack PR detection and error message

  completed successfully:
  Check for ghstack PRs#4:Pull request#3740synchronizebysekyondaMeta
  svekars-patch-54

  Feb 3, 20269s
  More actions for workflow run 4

• Add ghstack PR detection and error message

  completed successfully:
  Check for ghstack PRs#3:Pull request#3740synchronizebysvekars
  svekars-patch-54

  Jan 30, 20268s
  More actions for workflow run 3

• Add ghstack PR detection and error message

  completed successfully:
  Check for ghstack PRs#2:Pull request#3740synchronizebysvekars
  svekars-patch-54

  Jan 21, 20266s
  More actions for workflow run 2

• Add ghstack PR detection and error message

  completed successfully:
  Check for ghstack PRs#1:Pull request#3740openedbysvekars
  svekars-patch-54

  Jan 21, 20267s
  More actions for workflow run 1