Introduce a new field in the GitRepositoryReconciler to set the enabled
features. This makes it test friendly compared to using global flags for
setting and checking flags in the tests.
Enable default feature gates in all the GitRepo reconciler tests.
Add test cases for reconcileSource() to test the behavior of optimized
git clone when the Repo is ready and not ready. This ensures that the
full reconciliation is not skipped when GitRepo is not ready.
Signed-off-by: Sunny <darkowlzz@protonmail.com>