* [history-v1] add cheap endpoint for checking time of last history write
The /raw endpoint skips the GCS lookup for the chunk.
* [project-history] script for fixing-up files/metadata with bulk resync
* [project-history] upgrade structure only resync when full sync is needed
* [project-history] start resync and process resync updates under lock
* [project-history] stop retrying during graceful shutdown
GitOrigin-RevId: 73184d5786e1d40f5b7e21f387fc37cf43f0ac2d
