Merge pull request #31773 from colemanw/api3DeleteCruft

api/v3/ActivityType.php

api/v3/Case.php

api/v3/Constant.php

api/v3/CustomValue.php

api/v3/GroupContact.php

api/v3/MailingGroup.php

api/v3/Profile.php

api/v3/SurveyRespondant.php

deleted-files-list.json

tests/phpunit/api/v3/ActivityTest.php

tests/phpunit/api/v3/ActivityTypeTest.php

tests/phpunit/api/v3/ConstantTest.php

tests/phpunit/api/v3/GroupContactTest.php

tests/phpunit/api/v3/MultilingualTest.php

tests/phpunit/api/v3/ProfileTest.php

tests/phpunit/api/v3/SurveyRespondantTest.php

tests/phpunit/api/v3/SyntaxConformanceTest.php