[E2E] PROMOTE TO BLOCKING: group_runner_status_counts_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Verify Runner fleet management shows group runner online count | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #469669

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-07-01 02:06:16 UTC)