The class TextProtocolBackendHandlerFactory has already split into multiple Factory classes. It is better to split test cases into suitable classes.

• Move TCL related test cases into TransactionBackendHandlerFactoryTest
• Keep one TCL SQL test case in TextProtocolBackendHandlerFactoryTest and assert return TransactionBackendHandler
• Move DAL related test cases into `DALBacke

Although the platform API doesn't allow these actions, UI allows an Admin user changing the role of SuperAdmin user to a non-Admin user and also deleting a SuperAdmin user. These actions should be disabled for better UX.
cc @Arnav15 @chirag-yb