Revert "Restrict access to branch release-R129 to LTS Refresher group."

This reverts commit cf604785e7a3a8ba7a6f6942d2db446468758a73.

Reason for revert: LTS Refresh completed

Change-Id: Ie54e8f7f99ec811e3e927b4d8e9631a0cda808e7
Reviewed-on: https://cos-review.googlesource.com/c/All-Projects/+/143705
Tested-by: Derek Taylor <ddtaylor@google.com>
Reviewed-by: Kevin Berry <kpberry@google.com>