ci: fix check_enforcer.yml (microsoft#221)

# Description

fix check_enforcer head_sha.

# All Promptflow Contribution checklist:
- [x] **The pull request does not introduce [breaking changes]**
- [x] **CHANGELOG is updated for new features, bug fixes or other
significant changes.**
- [x] **I have read the [contribution guidelines](../CONTRIBUTING.md).**

## General Guidelines and Best Practices
- [x] Title of the pull request is clear and informative.
- [x] There are a small number of commits, each of which have an
informative message. This means that previously merged commits do not
appear in the history of the PR. For more information on cleaning up the
commits in your PR, [see this
page](https://github.com/Azure/azure-powershell/blob/master/documentation/development-docs/cleaning-up-commits.md).

### Testing Guidelines
- [x] Pull request includes test coverage for the included changes.

.github/workflows/check_enforcer.yml

@@ -3,12 +3,10 @@ name: GitHub Event Handler
 on:
   check_suite:
     types: [completed]
-  issue_comment:
-    types: [created]
 
 env:
   # note that this should be ${{ github.event.pull_request.head.sha }} for pull_request events
-  head_sha: ${{ github.sha }}
+  head_sha: ${{ github.event.check_suite.head_sha }}
 
 jobs:
   event-handler:
@@ -35,18 +33,13 @@ jobs:
       - name: Summarize check status
         id: summarize_check_status
         run: |
-          incomplete_check_count=$(jq -c '.check_runs | .[] | .status | select (.!="completed")' status.json | wc -l)
-          echo "incomplete_check_count: $incomplete_check_count"
-          
-          jq -c '.check_runs | .[] | select (.status!="completed") | .html_url' status.json | while read url; do
+          status="success"
+          jq -c '.check_runs | .[] | select (.conclusion!="success") | .html_url' status.json | while read url; do
             echo $url
+            status="pending"
           done
 
-          if [ $incomplete_check_count -gt 0 ]; then
-            echo "status=pending" >> "$GITHUB_OUTPUT"
-          else
-            echo "status=success" >> "$GITHUB_OUTPUT"
-          fi
+          echo "status=$status" >> "$GITHUB_OUTPUT"
 
       - uses: octokit/[email protected]
         name: Update the check enforcer status