Revert "Restrict access to release branch: release-R125 to LTS Refresher group."

This reverts commit d8fb5f140bdc420441fb23a45dfa46d96cc2bd9b.

Reason for revert: LTS refresh completed

Change-Id: Icb2156c0bec7861be1eba0d05e31f5b70706823b
Reviewed-on: https://cos-review.googlesource.com/c/All-Projects/+/131303
Reviewed-by: Kevin Liu <zhihuil@google.com>
Tested-by: Derek Taylor <ddtaylor@google.com>