Limit runner controllers to Ultimate tier

Taka Nishidarequested to merge
limit-runner-controllers-to-ultimate-tier into master

What does this MR do and why?

This change moves the "runner controllers" feature from the free version to Ultimate tier.

The main changes include:

  • Moving all runner controller code files from the main application to the EE folder
  • Adding license checks so the feature only works with a paid license
  • Adding the feature to the list of EE-only features
  • Updating tests to mock the license requirement

References

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/582986.

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