Don't break on window.CSS === null #4400
Description
Angular + Jest documentation recommends a solution which ends up setting window.CSS to null. This creates an issue when axe-core imports colorjs, which has a falsey check for window.CSS, but when null errors out.
Since ColorJS didn't accept our patch, we'll try to use patch-package to fix the issue ourselves. We'll need some tests to go along with that to confirm our solution continues to work after updating ColorJS.
patch-package should probably run in the build step, not as a post-install.