Update React testing to use @theforeman/find-foreman
This package was created and can be used by foreman plugins now https://www.npmjs.com/package/@theforeman/find-foreman/v/4.8.0
we can remove the logic in Katello and use this package
Fixes #30137 - Update tests to use @theforeman/find-foreman
The logic to find the foremand directory in a testing environment was made into an npm package (so it can be used across foreman plugins) and we can update to use this now.