CMS-764 Move functionality from GetContentTypeConfigRpcHandler into GetContentTypeRpcHandler

- updated getContentTypeRpcHandler  and test
- deleted getContentTypeConfigRpcHandler and test
- updated UI references
CMS-764 Move functionality from GetContentTypeConfigRpcHandler into GetContentTypeRpcHandler

- updated getContentTypeRpcHandler  and test
- deleted getContentTypeConfigRpcHandler and test
- updated UI references
- added missing jsons