Sergey Biryukov 2517aff837 Tests: Clean up test images in WP_Customize_Manager tests.
The test for `WP_Customizer_Manager::import_theme_starter_content()` creates two attachments that remain in the `uploads` directory after the test run is complete.

This commit follows the approach from `WP_REST_Posts_Controller` tests and utilizes an `$attachments_created` property to track any files uploaded in the current test run and clean them up afterwards.

This makes sure there are no leftover images after the test class is run.

Follow-up to [39276], [39346], [39411], [40142], [53935], [54424].

See #55652.

git-svn-id: https://develop.svn.wordpress.org/trunk@54425 602fd350-edb4-49c9-b593-d223f7449a82
2022-10-09 16:26:57 +00:00
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