[infra] Fix led permission for chromium.build builders

This CL gives led permission to more groups as same as ci.shadow bucket.
This CL also removes unused mdb/foundry-x-team permission.

Change-Id: I47231bc592be0b3f07483c4fba283931e968500e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5493002
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Junji Watanabe <jwata@google.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Junji Watanabe <jwata@google.com>
Cr-Commit-Position: refs/heads/main@{#1292849}