Convert Autosave conflict tests using AutoSaveConflictTestTrait into functional test to test caching

Overview

In 🐛 Add rudimentary conflict prevention to the Config Auto-save end-point Active updated the auto-save conflict detect test coverage to also cover Javascript components and Asset libraries. There were caching implications to the change in that issue because autoSaveStartingPoint value is created by the loading the save entity.

Unfortunately, the test coverage is still kernel tests which can't properly test caching, see \Drupal\Core\PageCache\RequestPolicy\CommandLineOrUnsafeMethod

Proposed resolution

We need to convert all the tests that use \Drupal\Tests\experience_builder\Kernel\AutoSave\AutoSaveConflictTestTrait into functional tests to test caching

User interface changes