6 files declare their use of FileFieldCreationTrait in Drupal 10

DrupalSelenium2DriverTest.php in core/tests/Drupal/FunctionalJavascriptTests/Tests/DrupalSelenium2DriverTest.php

FileFieldValidateTest.php in core/modules/file/tests/src/FunctionalJavascript/FileFieldValidateTest.php

FileFieldWidgetTest.php in core/modules/file/tests/src/FunctionalJavascript/FileFieldWidgetTest.php

InlineBlockPrivateFilesTest.php in core/modules/layout_builder/tests/src/FunctionalJavascript/InlineBlockPrivateFilesTest.php

MaximumFileSizeExceededUploadTest.php in core/modules/file/tests/src/FunctionalJavascript/MaximumFileSizeExceededUploadTest.php

QuickEditFileTest.php in core/modules/quickedit/tests/src/FunctionalJavascript/QuickEditFileTest.php