Enable stale runner cleanup Admin Area > Runners

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Problem to solve

In #342605 (closed) the Enable stale runner cleanup toggle switch was added to the Group view. For the next iteration of the auto-removal of stale runners feature, we need to add this capability to the Admin Area > Runners view. This is required so that administrators of self-managed GitLab can activate this feature at the instance level.

Implementation tasks:

• Add the enable stale runner toggle in the frontend in Admin Area > Settings as described in designs in design management.

• Implement worker to delete stale runners at the instance level, in groups and sub-groups.

• Create a new application setting for whether to clean up stale runners.

• Create a StaleRunnersPruneWorker that calls the service if the setting is enabled for the instance.

• Create a new cronjob for the worker.