8 files declare their use of CreateTestContentEntitiesTrait in Drupal 10

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

MigrateDrupal6AuditIdsTest.php in core/modules/migrate_drupal/tests/src/Kernel/d6/MigrateDrupal6AuditIdsTest.php

MigrateDrupal7AuditIdsTest.php in core/modules/migrate_drupal/tests/src/Kernel/d7/MigrateDrupal7AuditIdsTest.php

MigrateNodeCompleteTest.php in core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeCompleteTest.php

MigrateNodeCompleteTest.php in core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeCompleteTest.php

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

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

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