ci: Post Integration Tests Trigger Comment on Base Branch Change (#9897)

## Description
**Issue:** Integration tests were not triggered when base branch is changed from some-branch to master. Neither the PR author is aware that we have to re-trigger them.

**Solution:**
Wrote a github action which will subscribe "- edited" action and will be triggered on base branch change. As a result, a comment will be posted on PR notifying author to trigger integration tests.

**Why not do it programmatically? Other Solutions/Approaches**?
Such concerns are addressed in detail in following document:
https://docs.google.com/document/d/18cjQINkZ7Kc8eEGt0FrfuO78yShZAV32fnhfpG4A-9o/edit




### Security Considerations


### Scaling Considerations


### Documentation Considerations


### Testing Considerations


### Upgrade Considerations

.github/workflows/comment-on-base-branch-change.yml

@@ -0,0 +1,22 @@
+name: Post Integration Test Comment on Base Branch Change
+
+on:
+  pull_request:
+    types:
+      - edited
+
+jobs:
+  trigger:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.changes.base && github.event.pull_request.base.ref == 'master' }}
+    steps:
+      - name: Post a comment on the PR
+        uses: actions/github-script@v6
+        with:
+          script: |
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.payload.pull_request.number,
+              body: "Base branch is changed to master. Please re-run the integration tests by adding 'force:integration' label."
+            })