6 files declare their use of FileEntityDealerManagerInterface in Media Migration 8

D7FileEntityConfigDeriver.php in src/Plugin/migrate/D7FileEntityConfigDeriver.php

D7FileEntityDeriver.php in src/Plugin/migrate/D7FileEntityDeriver.php

FileEntityConfigSourceBase.php in src/Plugin/migrate/source/d7/FileEntityConfigSourceBase.php

FileEntityDealerTest.php in tests/src/Kernel/Plugin/FileEntityDealerTest.php

FileEntityItem.php in src/Plugin/migrate/source/d7/FileEntityItem.php

FileEntityItemTest.php in tests/src/Kernel/Plugin/migrate/source/d7/FileEntityItemTest.php