545-Replace req user with req userEntity in the user.controller.ts

[SangilYun]

Issue link / number:

https://github.com/chaynHQ/bloom-backend/issues/545

What changes did you make?

Replace req["user"] with req["userEntity"] in the user.controller.ts

Why did you make the changes?

To use the pure UserEntity schema/types for all internal functions.

Did you run tests?

Yes, cypress and unit tests ⭐️