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-cms/src/v1/landing/testimonials/testimonials_schema.rs

@@ -11,7 +11,7 @@ use super::testimonials_dto::{
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct TestimonialsSchema {
 	pub id: Thing,
-	pub user: Thing, // Link to app_users table
+	pub user: Thing,
 	pub role: String,
 	pub content: String,
 	pub is_deleted: bool,
@@ -28,7 +28,7 @@ impl Default for TestimonialsSchema {
 			),
 			user: make_thing(
 				&ResourceEnum::Users.to_string(),
-				&Uuid::new_v4().to_string(), // Placeholder, will be replaced by actual user ID
+				&Uuid::new_v4().to_string(),
 			),
 			role: String::new(),
 			content: String::new(),