After hitting shared runner limit no jobs are allowed

Summary

According to this report: https://gitlab.com/gitlab-org/gitlab-ce/issues/48870#note_140568699 once a group hits the shared runner limit - even if they also have group/project specific runners, GitLab.com blocks the jobs from happening because they are at quota.

Steps to reproduce

I think we should try and reproduce this. Alternatively, it was originally reported by @fciocchetti - could you open a ticket with our Support group so that we can look at your specific account?

Example Project

@fciocchetti if you have a public one that would be great, otherwise see above.

What is the current bug behavior?

• GitLab.com stops running any jobs once your group has hit the quota.

What is the expected correct behavior?

• GitLab.com allows my private runners to pick jobs.

Relevant logs and/or screenshots

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's very hard to read otherwise.)

Output of checks

This bug happens on GitLab.com

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)