Review sandbox caches now viewable and deletable

Cache management

CodeRabbit speeds up reviews and Finishing Touch runs by reusing a sandbox cache (a prepared copy of a repository and its installed dependencies) instead of rebuilding it from scratch every time.

Newly added Review > Caches tool gives organizations visibility and control over it. Users with Read access to Repository Settings can view and search the list; organization administrators with Write access can delete a cache to force an immediate rebuild. The next review, chat, or fix for that repository takes longer while CodeRabbit rebuilds the cache. See the caching documentation for more details.