* Rework of attributes using pathTree
* Pack meta reintroduced and made local
* attributes table test updated for new pathTree syntax
* removed flat import and extended the PathTree type signature to include prefix
* Slightly darken the is-faded text in tables
This continues #8455 by adding accessibility audits to component integration
tests and fixing associated errors. It adds audits to existing tests rather than
adding separate ones to facilitate auditing the various permutations a
component’s rendering can go through.
It also adds linting to ensure audits happen in component tests. This
necessitated consolidating test files that were scattered.