Enhance approval gate workflow with detailed pull request JSON output

- Updated the approval status job in the approval gate workflow to output the pull request details in JSON format, improving visibility and debugging capabilities during workflow execution.

Author: kubabuczak

.github/workflows/approval-gate.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Approval status
         run: |
           echo "Event: ${{ github.event_name }}"
-          echo "Pull request: ${{ github.event.pull_request }}"
+          echo "Pull request: ${{ toJson(github.event.pull_request) }}"
           echo "Author association: ${{ github.event.pull_request.author_association }}"
           echo "Approval granted or not required"