## Why
Prereleases are published before their assets are uploaded. A failed upload can leave an incomplete public release and prevent a rerun from recreating its `prereleased` event.
## What changed
Track newly created prereleases and successful asset uploads in the release workflow. Remove a newly created prerelease if its upload fails, preserving the tag so a rerun can recreate the release. Keep existing releases and releases whose assets finished uploading, even if the metadata update fails.
## Testing
Add a regression test that runs the workflow commands with a stubbed `gh`, covering upload failure cleanup, a successful rerun, preservation of existing prereleases, and metadata update failures after upload.
GitOrigin-RevId: 29411d6d1e649f4e8c67e84a41d9de2c9d31558f
jif
b6f53857fc