Trigger select `cosmos` and `spring` unit tests for `core` changes

[scbedd]

So that we don't accidentally merge broken core changes. Partner teams can indicate specific unit test projects if @alzimmermsft isn't already aware of the specifics.

[github-actions]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @kushagraThapar @pjohari-ms @TheovanKraay.