Move status report assets to their own library

This needs basic manual testing. Install the standard profile, visit admin/reports/status, apply the MR, clear caches, refresh the page - make sure it's still styled correctly.

Applied the MR and went to the status report page and all seems fine, is there another thing I should be testing?

Moving to NW as the test failures I believe are legit as they are all around test performance.

@smustgrave it should only affect the status report so that should be sufficient testing.

Updated the performance tests - all expected reductions in the amount of CSS we serve so that's good.

In that case status report page seems fine.

nod_ → closed merge request !11433

Committed e10e162 and pushed to 11.x. Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.