Redirect user after the successful login

[kshmidt-digma]

Currently, redirect happens on the client-side, which is considered a bad practice.

Affected endpoints:

1. /auth
2. /auth/google

Related:
https://github.com/digma-ai/digma-ui/security/code-scanning/12
https://github.com/digma-ai/digma-ui/security/code-scanning/13
https://github.com/digma-ai/digma-ui/security/code-scanning/14
https://github.com/digma-ai/digma-ui/security/code-scanning/15