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-utils/Cargo.toml

@@ -4,8 +4,8 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-imphnen-libs = { path = "../imphnen-libs"}
-imphnen-entities = { path = "../imphnen-entities" }
+imphnen-libs.workspace = true
+imphnen-entities.workspace = true
 surrealdb.workspace = true
 axum.workspace = true
 chrono.workspace = true
@@ -15,3 +15,7 @@ axum-test.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 validator.workspace = true
+strum.workspace = true
+strum_macros.workspace = true
+uuid.workspace = true
+tracing.workspace = true