[Maintenance] Exempt feature branches from changelog verification wor…

…kflow (opensearch-project#3123)

Signed-off-by: Josh Romero <rmerqg@amazon.com>
Signed-off-by: Arpit Bandejiya <abandeji@amazon.com>

.github/workflows/changelog_verifier.yml

@@ -1,6 +1,7 @@
 name: "Changelog Verifier"
 on:
   pull_request:
+    branches: [ '**', '!feature/**' ]
     types: [opened, edited, review_requested, synchronize, reopened, ready_for_review, labeled, unlabeled]
 
 jobs: