Set the correct repo link in mark unstable job button in commit and PR pages (#5343)

This is a miss from #5122
where I failed to check that the repo field in JobData is optional and
wasn't set in HUD commit and PR pages. So, marking an unstable job link
works correctly in main HUD page like
https://hud.pytorch.org/hud/pytorch/executorch/main where the data comes
from `fetchHud`, but it uses the default link pointing to
`pytorch/pytorch` in:

* Commit page
https://hud.pytorch.org/pytorch/executorch/commit/7c0f4c2b6f87369ee20544aada33dc55078c6bc6
* and PR page https://hud.pytorch.org/pr/pytorch/executorch/3972

The fix here is to populate the repo field if it's not there

### Testing

Verify this locally (need to login to HUD)

*
http://localhost:3000/pytorch/executorch/commit/7c0f4c2b6f87369ee20544aada33dc55078c6bc6
* http://localhost:3000/pr/pytorch/executorch/3972

Author: huydhn

torchci/components/CommitStatus.tsx

@@ -119,6 +119,11 @@ export default function CommitStatus({
   const session = useSession();
   const isAuthenticated = session.status === "authenticated";
 
+  // Populate the repo field if it's not yet set in the job data
+  jobs.forEach((job) => {
+    job.repo = job.repo ?? `${repoOwner}/${repoName}`;
+  });
+
   return (
     <>
       <VersionControlLinks