* [clsi] tweak logging for clsi-cache
- Use `clsi-cache` identifier on log line
- Add shard to context
- Record nFiles on "too many entries for tar" error
* [clsi] do not trip clsi-cache circuit breaker on ENOENT errors
These can happen when an output/compile-dir is purged while we download
files.
GitOrigin-RevId: ffa73ef312bce5232ef72e3b81966bb6e14d2255