Deactivate mirrors for projects without license

What does this MR do and why?

• Contributes to #216783 (closed)
• Incident: gitlab-com/gl-infra/production#7420 (closed)

Problem

Projects without a correct license are picked up by UpdateAllMirrorsWorker but we skip their processing. It increases amount of work for the worker and impacts the performance.

Solution

Mark projects without a license as hard failed to exclude them from the UpdateAllMirrorsWorker query.

Screenshots or screen recordings

How to set up and validate locally

1. Enable the feature flag

   Feature.enable(:hard_failure_for_mirrors_without_license)

2. You need a public project without legacy_open_source_license (project.project_setting.legacy_open_source_license_available? => false)
3. Run UpdateAllMirrorsWorker.new.perform from Rails console
4. The project import state must be failed with retry count equal 15

    => #<ProjectImportState:0x00007fd1f5216050
      ...
      retry_count: 15,
      status: "failed",
      last_error: "Project mirroring is not supported",
      ...

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.