Don't re-run workflows on un/approvals (strands-agents#516)

These were necessary when we had conditional running but we switched to needing to approve all workflows for non-maintainers, so we no longer need these.

Co-authored-by: Mackenzie Zastrow <[email protected]>

Author: zastrowm

.github/workflows/pr-and-push.yml

@@ -3,7 +3,7 @@ name: Pull Request and Push Action
 on:
   pull_request:  # Safer than pull_request_target for untrusted code
     branches: [ main ]
-    types: [opened, synchronize, reopened, ready_for_review, review_requested, review_request_removed]
+    types: [opened, synchronize, reopened, ready_for_review]
   push:
     branches: [ main ]  # Also run on direct pushes to main
 concurrency: