### _Why are the changes needed?_
Followup for #3957 comments
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#3963 from turboFei/unlimited_user.
Closes#3957
987b71f1e [fwang12] refactor
e0c6ca515 [fwang12] [KYUUBI #3957][FOLLOWUP] Refactor the session connection unlimited user list config
Authored-by: fwang12 <fwang12@ebay.com>
Signed-off-by: fwang12 <fwang12@ebay.com>