web/improve testability
This is a trio of small hacks that allow the E2E tests to find several components
on the page while the test is running:
- Add a `data-managed-for` field to SearchSelect's positioned elements. If a search
has a `name` field, it will be reflected here, allowing tests to find specific
instances of the dropdown elements.
- Add a forwarder to the search select wrappers we use for our SearchSelect.
- Added aria details to the UserLibrary header to make it easy to identify.