Support github codeowners with branch protection on codeowners

[nitrocode]

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Overview of the Issue

Approval by non-codeowner allows the apply and fails to merge

Reproduction Steps

The github repo has codeowners
The branch protections enforce codeowners
The pr was approved by a NON codeowner
atlantis apply was commented
terraform apply was run (which shouldn't have happened)
pr failed to merge
atlantis/apply pr check is in a failed state

Logs

n/a

Environment details

0.27.2

Additional Context

n/a

[stasostrovskyi]

Atlantis cannot reflect every single permutation of what people consider a PR to be ok to be applied/merged, but GitHub can. So I guess right way forward is to use mergeable as apply_requirement and configure everything else in branch protection/rulesets.