Allow to enable the performance bar per user or Feature group

• EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2344
• Omnibus MR: https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1724

What does this MR do?

• This adds a feature group called performance_team that can be enabled via the API. This feature group has access to the performance_bar feature.
• This performance_team feature group is tied to a GitLab group that can be configured in config/gitlab.yml via the performance_bar.allowed_group setting. It defaults to nil.

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #33929, #34528 (closed).