Unify runner performance feature in gitlab subscriptions

The following discussion from !107385 (merged) should be addressed:

• @pedropombeiro started a discussion: (+2 comments)

  question: I am using runner_jobs_statistics for the GraphQL query and permissions check. Should we standardize on one feature, or does it make sense to have 2 different features?

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Proposal

Use only runner_performance_insights and remove runner_jobs_statistics to gate GitLab Ultimate that relate to metrics.

• Fleet dashboard
• GraphQL to fetch performance metrics (mostly shown in the dashboard anyway!)