[github] Upload workflow_run.json and jobs.json to GCS.
We currently upload junit xml files for test results, but we'd like to also store the complete metadata (as stored by the github workflow_run / jobs API) for each workflow run and its jobs for querying in post-hoc analyses. We do not want github tokens for post-processing.
NOTE 1: This is a reusable workflow because 1) the workflow_runs and jobs APIs are given at the workflow level and 2) we don't need to do this for each job.
NOTE 2: We may need to submit this first before we can test in situ.
PiperOrigin-RevId: 895960354
