Build/Test Tools: Hardcode the ref for the workflow dispatch on failure.

This removes the dynamic aspect of the `createWorkflowDispatch()` call that dispatches a Failed Workflow run when another workflow encounters an issue.

By hardcoding `trunk` as the `ref`, the version of the workflow used will always be the latest, most up to date. This ensures older branches receive the bug fixes and improvements made in `trunk` without having to backport them.

See #55652.

git-svn-id: https://develop.svn.wordpress.org/trunk@54674 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/javascript-tests.yml

@@ -123,7 +123,7 @@ jobs:
               owner: context.repo.owner,
               repo: context.repo.repo,
               workflow_id: 'failed-workflow.yml',
-              ref: '${{ github.ref_name }}',
+              ref: 'trunk',
               inputs: {
                 run_id: '${{ github.run_id }}'
               }