[Backport 2.x] Reduce unnecessary duplication of changelog verifier GHA runs (#647)

Reduce unnecessary duplication of changelog verifier GHA runs (#646)


(cherry picked from commit 51e229c)

Signed-off-by: Daniel Widdis <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

.github/workflows/changelog_verifier.yml

@@ -6,7 +6,7 @@ on:
       - 'backport/**'
   pull_request:
     branches: main
-    types: [opened, edited, review_requested, synchronize, reopened, ready_for_review, labeled, unlabeled]
+    types: [opened, synchronize, reopened, ready_for_review, labeled, unlabeled]
 
 jobs:
   # Enforces the update of a changelog file on every pull request