Increase execution time to reduce flakiness metrics_test_fetches_top_job_data

What does this MR do and why?

Quarantine metrics_test_fetches_top_job_data

This test is failing as per issue gitlab-org/quality/engineering-productivity/master-broken-incidents#6939 (closed) Looks like a flaky test, hence quarantining for now

Changelog: performance

Update

As per slack conversation with Sylvester, increasing execution time at line - https://gitlab.com/gitlab-org/gitlab/-/blob/27181c0b570695ba6e8288b4ec31a6a5509d10cd/vendor/gems/sidekiq-7.1.6/test/metrics_test.rb#L32 may result in less flakiness when it comes to sidekiq test . Spec failure here - https://gitlab.com/gitlab-org/gitlab/-/jobs/7121179725#L67 we can see execution time crossed the one specified in spec.

We cannot quarantine this test since that function is not available to vendor/gems/ specs.