Pull projects and versions when user types project name

Please note: this is for the 8.x-4.x branch and has a dependency of https://www.drupal.org/project/simplytest/issues/3063298

We have the basics of a React application that will serve as the main end-user form for simplytest.

We have set up an initial component, found here: https://git.drupalcode.org/project/simplytest/blob/8.x-4.x/themes/simply...

This needs to be refactored to just be the project version selector, not specific to Drupal core.

There needs to be a new component for the autocomplete widget, where a user types the name of the project and this triggers the population of the select widget. The select widget should be hidden until the user selects a project from the autocomplete widget.

The autocomplete widget should pull from a new endpoint created to pass a string and search for a matching project.

The "DrupalSelection" component should be refactored to just be a "ProjectSelection" component that contains both the autocomplete and the select component. https://git.drupalcode.org/project/simplytest/blob/8.x-4.x/themes/simply...

All of the logic to populate the select dropdown needs to be replaced with the new endpoint, found in this issue: https://www.drupal.org/project/simplytest/issues/3063298