Snapshot manifest compressed; update nagger now shows

Features

• (snapshots) Compress preprod snapshot manifest with zstd (#3336)

Fixes

• (snapshots) Update snapshots download to use the new archive endpoint, triggering the archive build and polling until it is ready before downloading (#3344)
• (snapshots) Show a clear "project was renamed" error instead of a cryptic JSON parse failure when uploading to a renamed project slug (#3341)
• Fix update nagger never showing when a newer version is available (#3347)