feat: improve milestone merge workflows. (#958)

Author: mo3et

.github/workflows/merge-from-milestone.yml

@@ -331,13 +331,21 @@ jobs:
                 mv /tmp/milestone_migration/results.json.tmp /tmp/milestone_migration/results.json
               else
                 echo "Failed to create PR"
+
+                echo "Deleting branch $new_branch since PR creation failed"
+                git push origin --delete $new_branch 2>/dev/null || echo "Branch deletion failed"
+                
                 # Record failure
                 jq --argjson result "{\"original_pr\": $pr_number, \"status\": \"failure\", \"message\": \"Failed to create PR\"}" \
                   '.+= [$result]' /tmp/milestone_migration/results.json > /tmp/milestone_migration/results.json.tmp
                 mv /tmp/milestone_migration/results.json.tmp /tmp/milestone_migration/results.json
               fi
             else
               echo "⏭️ Skip PR #$pr_number: no actual changes"
+
+              echo "Deleting branch $new_branch since PR creation failed"
+              git push origin --delete $new_branch 2>/dev/null || echo "Branch deletion failed"
+
               # Record as skipped
               jq --argjson result "{\"original_pr\": $pr_number, \"status\": \"skipped\", \"message\": \"No actual changes\"}" \
                 '.+= [$result]' /tmp/milestone_migration/results.json > /tmp/milestone_migration/results.json.tmp
@@ -348,6 +356,8 @@ jobs:
             git checkout $TARGET_BRANCH
           done
 
+      # Pending
+
       # - name: Create results report
       #   run: |
       #     echo "Generating results report..."