Revert^2 "Restrict access to release branch: release-R109 to LTS Refresher group." This reverts commit 76a056715ab0422d877be4f5676e3c528babdd9c. Reason for revert: lock again after source manager succeeds Change-Id: Ie7350ad6972d30bb15ce8ab3db95e83372234254 Reviewed-on: https://cos-review.googlesource.com/c/All-Projects/+/90522 Reviewed-by: Chenglong Tang <chenglongtang@google.com> Tested-by: He Gao <hegao@google.com>