Daily runner usage

Extracted from : https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/6360#note_157441581

if we could get another report into CI, which gives us daily runner usage (aggregated on total CI runner minutes per day) by the following categories?

1. gitlab: GitLab and GitLab forks (this could be as simple as checking for "gitlab-ce"/"gitlab-ee" in the project path)
2. free-public: shared runners for non-paid public projects
3. free-nonpublic: shared runners for non-paid non-public projects
4. paid: shared runners for non-free projects
5. private-runners: non-shared runner projects