Build/Test Tools: Limit cancelled Slack notifications.

When a worfklow run in GitHub Actions reaches the configured timeout value, the workflow is considered cancelled. Since there is an automatic re-run mechanism built into the project’s workflows, it’s not necessary to post a message in Slack that the first run has been cancelled.

This adjusts the conditional checks controlling the cancelled notices so only the second run attempt results in a Slack notification.

See #64893.

git-svn-id: https://develop.svn.wordpress.org/trunk@62740 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.github/workflows/slack-notifications.yml

@@ -218,7 +218,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 20
     needs: [ prepare ]
-    if: ${{ inputs.calling_status == 'cancelled' || cancelled() }}
+    if: ${{ inputs.calling_status == 'cancelled' && github.run_attempt == 2 || cancelled() }}
 
     steps:
       - name: Post cancelled notifications to Slack