Workflows triggered by `workflow_run` events did not produce commit
statuses because `getCommitStatusEventNameAndCommitID` had no case for
`HookEventWorkflowRun`. The function returned empty strings, so
`CreateCommitStatusForRunJobs` silently skipped status creation.
Add a `workflow_run` case that walks up the parent run chain (up to 5
levels) to find the original triggering event's commit SHA and attaches
the status there. This makes chained `workflow_run` workflows visible
in the commit status popover alongside the root workflow.
