Fix block-remove-before-merge workflow failing on merge_group events (#1798)

* Initial plan

* Fix block-remove-before-merge workflow to skip on merge_group events

Co-authored-by: edburns <75821+edburns@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: edburns <75821+edburns@users.noreply.github.com>

Author: Copilot

.github/workflows/block-remove-before-merge.yml

@@ -11,6 +11,7 @@ permissions:
 jobs:
   check-paths:
     name: "No remove-before-merge directories"
+    if: github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     steps:
       - name: Check for remove-before-merge paths in PR