also adds two plural forms that were missing

It has new API which we want to use.

This got added in scoped-element 2.1.0 and is more or less the same
as getShadowRootDocument()

This is inspired by how lion web components handle this, and much cleaner.

Newest Ubuntu switched Firefox to a snap, which breaks karma.

Try to use playwright to download and cache firefox/chromium
and use those for karma.

Compared to puppeteer where we did this some time ago this caches
the browsers globally, and only downloads them when we start the tests.

The goal of this new component is to be a generic selector for API resources,
unlike the organization/person select, which hardcode various things for their
used resource.

Instead this provides some events which can be used to customize the creation of the
URL for fetching as well as for formatting the list of results.

Atm this only handles the organization and no search-as-you-type like the person select,
but maybe this can be extended in the future.