Removes GitLab managed app dependency
What does this MR do?
Removes GitLab managed app dependency
The GitLab and the GitLab runner security releases can be run independently. This commit removes the gitlab-managed-apps section and any other item that referenced them. Even though the releases can be performed independently they should be published at the same time to make the communications easier.
Why was this MR needed?
Corrective action of https://gitlab.com/gitlab-com/runner-group/team-tasks/-/issues/167#note_1012198894