Changelog for repo: 2.65 -> 2.66

d9da609 project: preserve -c optimization when revision is a SHA-1
4bec297 command: Respect smart sync override declaratively by default
54fa31c project: derive HEAD fallback from git's own default branch
29b6630 project: make GetHead file-read fallback reftable-aware
0b82311 sync: allow syncing groups with repo sync -g group
06c4f9e git_superproject: don't filter rewritten manifest
dd11303 sync: Deprecate fetch-submodules flag names
eeba6f2 hooks: pass yes flag when available
1729aae project: Skip superproject upstream check for MetaProjects
978adb7 sync: Add CLI flag for globally disabling submodule fetch
0398c67 color: Replace anonymous sentinel with named class
3bb4871 rebase: Resolve revisionExpr to tracking branch for --onto-manifest