Add more frequent mirroring on Gitlab.com for higher tiers

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Problem to solve

GitLab CI for external repositories is currently reliant on the repository mirroring capability. In 13.0, #118753 (closed) added an application limit on pull mirroring that enforced a 5 minute delay between mirroring/updates. This hard-coded maximum mirror frequency negatively impacted CI pipelines for external repos, making this CI feature effectively un-usable for teams pushing more often than once every 5 minutes.

In #237891 (closed) we are addressing this problem for self-hosted users only.

Proposal

• On Gitlab.com, the default could remain 5 minutes but would also support per-plan limits with increased mirror frequency for higher tiers (More exploration is needed to determine what limits are feasible without adversely affecting performance)

NOTE: Long term solution to make CI for external repositories more performant will be addressed in #235916 (closed).