Add action that fails if a PR has no label attached

Author: jacob720

.github/workflows/_require_label.yml

@@ -0,0 +1,16 @@
+name: Pull Request Labels
+on:
+  pull_request:
+    types: [opened, labeled, unlabeled, synchronize, reopened, ready_for_review, draft]
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: mheap/github-action-required-labels@v5
+        with:
+          count: 1
+        add_comment: true
+        message: "Please attach a label to this PR. This helps with generating helpful release notes."