Mesh-2092: prettify message

Author: james-bradley-nhs

.github/workflows/pull-request.yml

@@ -326,4 +326,4 @@ jobs:
           webhook: ${{ secrets.DEPENDABOT_SLACK_WEBHOOK_URL }}
           webhook-type: incoming-webhook
           payload: |
-            text : ":alarm: Dependabot PR checks failed for ${{ github.repository }}:${{ github.ref }} in PR #${{ github.event.number }} :alarm:"
+            text : ":alarm: DEPENDABOT PR FAILED for ${{ github.repository }}:${{ github.ref }} in <https://github.com/${{ github.repository }}/pull/${{ github.event.number }}|PR #${{ github.event.number }}> :alarm:"