feat: Branch protection rules

mentioned in merge request !2021 (merged)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!3 (merged)

mentioned in commit 4123853d

mentioned in merge request !2025 (closed)

mentioned in issue #1606 (closed)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!12 (closed)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!26 (merged)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!28 (closed)