Changelog for repo: 2.66.1 -> 2.67

d27d682 project: check upstream ref ancestry for non-shallow clones
0ea57e2 project: gate the default-branch query by Git version
ba8ddf3 git_superproject: resolve one negotiation ref directly
d88ce8d upload: reuse the worker current-branch result
5e8d2a6 version: read describe and date in one Git call
e59c9cd cherry_pick: resolve and read commits in one process
83428a9 rebase: delegate automatic stashing to Git
948abc8 git_config: recognize only complete object IDs
c63a2f9 sync: tell apart same-path submanifest projects
0039e39 project: carry current state from the ref snapshot
5f37845 project: reuse ref OIDs in branch maintenance
d27034b project: centralize safe branch and commit resolution
6541729 project: reuse loaded refs when resolving HEAD
b85e76a git_refs: load HEAD with the ref snapshot on Git 2.45
e5bbb5c upload: prune ref scans for untouched projects and specific branches
4fe8761 project: read HEAD directly in-memory to avoid subprocesses
d729942 sync: skip submodules removed from their parent
3f087a8 sync: fetch submodules after their parent repository
3a6e25a sync: check out submodules at the parent's new revision
41c2597 project: don't use dest-branch or tags as SHA-1 upstream fallback
e6ad708 hooks: add --fix option to auto-apply hook fixes
09914bc Add detailed upload context to Trace2 telemetry
3f17756 project: allow re-reading submodule gitlinks