Require status checks to pass before testmerges can be applied

[PowerfulBacon]

Is your feature request related to a problem? Please describe.
Occasionally, PRs are testmerged just after a commit is pushed. I would like to prevent developers from testmerging PRs that haven't run through the checks in a way that cannot be bypassed.

Describe the solution you'd like
If a PRs requirs status checks are still running, I would like the testmerge to not compile until those status checks pass. If they fail, then the deployment should fail.

Describe alternatives you've considered
Procedure, but this can be ignored, forgotten or easily bypassed

Additional context
It would be convenient to not have to wait and have it delayed automatically.