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

This reverts commit bbcab81e7d6c39e90b509e29b9c016253d3092c6.

Reason for revert: Refresh appears to be finished

Change-Id: I6ddef53ac632e86ef829e768b16064c3e6f6e3b9
Reviewed-on: https://cos-review.googlesource.com/c/All-Projects/+/154844
Tested-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Reviewed-by: Miri Amarilio <mirilio@google.com>