All QuickEdit integration test code, including QuickEditImageEditorTestTrait, has been moved to the QuickEdit namespace

The QuickEdit module will no longer be included in Drupal core starting with Drupal 10. In preparation for this change, all integration tests for QuickEdit have been moved into the QuickEdit module's namespace.

One of the moved files is:
core/modules/image/tests/src/FunctionalJavascript/QuickEditImageEditorTestTrait.php

Any tests using this trait will need to update the trait namespace.

Before

use Drupal\Tests\image\FunctionalJavascript\QuickEditImageEditorTestTrait;

After

use Drupal\Tests\quickedit\FunctionalJavascript\QuickEditImageEditorTestTrait;