6 files declare their use of MigrateDestinationInterface in Drupal 10

DestinationBase.php in core/modules/migrate/src/Plugin/migrate/destination/DestinationBase.php

MigrateExecutableTest.php in core/modules/migrate/tests/src/Unit/MigrateExecutableTest.php

MigrateLookupTest.php in core/modules/migrate/tests/src/Unit/MigrateLookupTest.php

MigrateStubTest.php in core/modules/migrate/tests/src/Unit/MigrateStubTest.php

MigrationStateUnitTest.php in core/modules/migrate_drupal/tests/src/Unit/MigrationStateUnitTest.php

MigrationTest.php in core/modules/migrate/tests/src/Unit/MigrationTest.php

Contains \Drupal\Tests\migrate\Unit\MigrationTest.