E2E TEST ONLY: allow advance_production_rollout off trunk

Author: oguzkocer

fastlane/lanes/promote.rb

@@ -251,7 +251,8 @@
   lane :advance_production_rollout do
     # Set once the per-app result has been posted, so the rescue doesn't double-report it.
     result_posted = false
-    ensure_promotion_on_trunk!
+    # E2E TEST BRANCH ONLY — `ensure_promotion_on_trunk!` removed so this can run off trunk.
+    # Never merge this branch.
     # Fail loudly up front if Slack isn't configured (see gather_beta_candidates).
     get_required_env('SLACK_WEBHOOK')