Issue #3069541 by quietone, heddn: ValidateMigrationState should load test fixture

...n/migrations/state/content_translation.migrate_drupal.yml

...drupal/tests/src/Kernel/d6/ValidateMigrationStateTest.php

...drupal/tests/src/Kernel/d7/ValidateMigrationStateTest.php

...upal/tests/src/Traits/ValidateMigrationStateTestTrait.php

...ui/tests/src/Functional/d6/MultilingualReviewPageTest.php

...igrate_drupal_ui/tests/src/Functional/d6/Upgrade6Test.php

...ui/tests/src/Functional/d7/MultilingualReviewPageTest.php

...igrate_drupal_ui/tests/src/Functional/d7/Upgrade7Test.php