Disable repo locking in Atlantis, and hide previous plan comments
What
- Disable repo locking in Atlantis, to allow concurrent TF plans between multiple MRs, we'll be able to re-enable it after https://github.com/runatlantis/atlantis/issues/2237
- Hide previous plan comments to unclutter MR comments
Why
Part of https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24174