Modify VTS error check so that the error code can be displayed

- Add AssertionResult in gtest to display logs
- Refactor all the error checks

- Replace INTERNAL_ERR with INVALID_ARGUMENT for 
requestIsimAuthentication

Bug: 63760809
Bug: 65150146
Test: run vts
Change-Id: Iec4bdfd89ccd8d8d8c6e1bd8f720a88d67f23cb3