Fix: [AEA-0000] - fail job on bad pr format (#20)

## Summary

- Routine Change

### Details

- force failure on bad pr format

Author: anthony-nhs

.github/workflows/pr_title_check.yml

@@ -86,3 +86,9 @@ jobs:
                       See the contributing guide for more details:
                       https://github.com/NHSDigital/eps-common-workflows/blob/main/CONTRIBUTING.md
                   comment-tag: pr-link
+
+            - name: Fail job due to invalid PR title format
+              if: steps.check_prefix.outcome != 'success' || steps.check_ticket_reference.outcome != 'success'
+              run: |
+                  echo "Job failed due to invalid PR title format."
+                  exit 1