Draft: JobAnalytics GraphQL API Improvements

What does this MR do and why?

References

#580442

How to set up and validate locally

Sample Query:

{
  project(fullPath: "gitlab-org/gitlab") {
    jobAnalytics(
      nameSearch: "mock"
      sort: MEAN_DURATION_ASC
      first: 20
      fromTime: "2025-01-01 00:00:00 UTC"
    ) {
      nodes {
        name
        statistics {
          successRate: rate(status: SUCCESS)
          failureRate: rate(status: FAILED)
          success: count(status: SUCCESS)
          failure: count(status: FAILED)
          total: count
          durationStatistics {
            mean
            p50
            p95
          }
        }
      }
    }
  }
}

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