6 files declare their use of MigrationConfigurationTrait in Drupal 10

MigrateUpgradeFormBase.php in core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeFormBase.php

MigrateUpgradeFormStepsTest.php in core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeFormStepsTest.php

MigrateUpgradeTestBase.php in core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php

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

StateFileExistsTest.php in core/modules/migrate_drupal/tests/src/Kernel/StateFileExistsTest.php

ValidateMigrationStateTestTrait.php in core/modules/migrate_drupal/tests/src/Traits/ValidateMigrationStateTestTrait.php