chore(scripts): nocleus (#5728)

remove nucleus from copy-fork script because we don't use it any more

Author: wjhsf

scripts/tasks/unsafe-external-contributor-ci-workaround.sh

@@ -79,9 +79,3 @@ gh pr create \
   --body "External contributors do not have access to CI secrets. This PR serves as a workaround to trigger CI with secrets for #$NUMBER."
 git switch -
 gh pr close "$INTERNAL_BRANCH" --delete-branch
-
-# Trigger nucleus tests
-gh pr comment "$NUMBER" -b '/nucleus test'
-
-# Open the original PR in browser to validate that CI is running correctly
-gh pr view --web "$NUMBER"