Fix community Merge Request pipeline parse errors

What does this MR do?

Resolves a CI pipeline parse issue for community MRs.

Why was this MR needed?

Without addressing the underlying issue, MRs from the community fork were getting pipeline parse errors due to the coverage report job needing the results from the window tests, but windows tests were not running for community merge requests. As an example failure, see: https://gitlab.com/gitlab-community/gitlab-runner/-/pipelines/857747940.

What's the best way to test this MR?

The initial test is simply to see if community MRs can run again with these results. I don't have strong opinions on whether the current fix implemented here is the right fix, so comments/suggestings/improvements welcome.

What are the relevant issue numbers?

I haven't filed nor found an issue documenting the error I encountered.