Add comprehensive tests for mentor repository and authentication

- Implemented tests for creating, retrieving, updating, and deleting mentors in `mentor_repository_test.rs`.
- Added tests for user authentication, including successful login, invalid email formats, and inactive users in `auth_login_tests.rs`.
- Created a mock test environment setup in `mock_test.rs` to facilitate database operations during tests.
- Updated module structure to include new test files for mentors and authentication.
- Ensured cleanup of the database after tests to maintain isolation and prevent side effects.

imphnen-iam/src/v1/auth/mod.rs

@@ -15,6 +15,7 @@ pub fn auth_router() -> Router {
 	Router::new()
 		.route("/forgot", post(auth_controller::post_forgot_password))
 		.route("/login", post(auth_controller::post_login))
+		.route("/login-mentor", post(auth_controller::post_login_mentor))
 		.route("/new-password", post(auth_controller::post_new_password))
 		.route("/refresh", post(auth_controller::post_refresh_token))
 		.route("/register", post(auth_controller::post_register))