Additional Labeler Workflow Triggers (#6272)

# About the pull request

This PR simply expands the trigger for the labeler workflow. I would
like the workflow to be required, but as is it simply blocked the merge
queue when the `label` was made into a required check.

# Changelog

No player facing changes.

.github/workflows/labeler.yml

@@ -1,7 +1,8 @@
 name: Labeling and Verification
 on:
   pull_request_target:
-    types: [opened, edited]
+    types: [opened, reopened, edited]
+  merge_group:
 jobs:
   label:
     runs-on: ubuntu-latest