test(git): pin down the JGit behaviour the git operations rely on

Run the command chains of SyncOperation, PushOperation,
BreakOutOfDetached and ResetToRemoteOperation against a local bare
repository and assert the results GitCommandExecutor branches on:
rebase success, push OK / UP_TO_DATE / REJECTED_NONFASTFORWARD, a
stopped rebase with its branch recoverable, abort and push to a
conflict branch, and hard reset to the remote. Passes on JGit 4.5.7;
it is the safety net for the JGit upgrade.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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