Reduce cost factor for community contributors of GitLab-org to run sufficient pipelines

Problem

With the enforcement of CI minutes for public projects and the use of cost_factor: 0.008 has shown some impacts to the wider-community contributing to gitlab-org projects, primarily gitlab-org/gitlab project.

The problem is primarily the large pipeline that consumes a lot of CI minutes which are counted against the contributor's quota.

Proposal

• For a contribution to any gitlab-org or gitlab-com group project from a fork:
  • Use cost factor (monthly limit / 300,000)