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/permissions/permissions_service.rs

@@ -1,7 +1,7 @@
 use crate::{
-	common_response, make_thing, success_list_response, success_response,
-	validate_request, AppState, MetaRequestDto, PermissionsRepository,
-	PermissionsSchema, ResourceEnum, ResponseListSuccessDto, ResponseSuccessDto,
+	AppState, MetaRequestDto, PermissionsRepository, PermissionsSchema, ResourceEnum,
+	ResponseListSuccessDto, ResponseSuccessDto, common_response, make_thing,
+	success_list_response, success_response, validate_request,
 };
 use axum::http::StatusCode;
 use axum::response::Response;