CI/CD-only does not work properly when force pushing branches

Summary

CI/CD-only projects when used do not support force pushing of upstream projects.

Steps to reproduce

1. Create a new project on GitHub,
2. Commit on GitHub,
3. Create a CI/CD-only project on GitLab,
4. Amend and force push to GitHub,
5. Expect to see the same commit on GitLab.

What is the current bug behavior?

This fails as a newly created project has Protected Branches configured on master which prevents mirroring from updating the target branch.

What is the expected correct behavior?

Protected Branches should not be configured for mirrored / CI/CD-only projects.