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/roles/roles_enum.rs

@@ -5,6 +5,7 @@ pub enum RolesEnum {
 	Admin,
 	User,
 	Staff,
+	Mentor, // Added Mentor role
 }
 
 impl fmt::Display for RolesEnum {
@@ -13,7 +14,8 @@ impl fmt::Display for RolesEnum {
 			RolesEnum::Admin => "Admin",
 			RolesEnum::User => "User",
 			RolesEnum::Staff => "Staff",
+			RolesEnum::Mentor => "Mentor", // Added Mentor role
 		};
-		write!(f, "{}", roles_str)
+		write!(f, "{roles_str}")
 	}
 }