Issue #3347160 by kristiaanvandeneynde: Remove unnecessary ProphecyTrait

tests/src/Unit/AccessControlTest.php

tests/src/Unit/EntityReferenceTest.php

tests/src/Unit/GroupPermissionCheckerTest.php

tests/src/Unit/GroupPermissionHashGeneratorTest.php

tests/src/Unit/GroupPermissionsCacheContextTest.php

tests/src/Unit/GroupRelationTypeManagerTest.php

tests/src/Unit/GroupRelationshipAccessControlHandlerTest.php

tests/src/Unit/IsGroupMemberCacheContextTest.php

tests/src/Unit/OperationProviderTest.php

tests/src/Unit/PermissionProviderTest.php

tests/src/Unit/RouteGroupCacheContextTest.php

tests/src/Unit/UiTextProviderTest.php