Add comprehensive tests for hackathon service functionality

- Implemented tests for creating, retrieving, updating, and deleting hackathons.
- Added validation tests for hackathon creation and updates.
- Included tests for hackathon events and timelines, ensuring proper handling of edge cases.
- Created tests for hackathon submissions, including validation and submission status updates.
- Organized tests into a dedicated module for better structure and maintainability.

tests/Cargo.toml

@@ -12,6 +12,7 @@ imphnen-dimentorin.workspace = true
 imphnen-entities.workspace = true
 imphnen-libs.workspace = true
 imphnen-utils.workspace = true
+imphnen-hackathon.workspace = true
 http-body-util.workspace = true 
 hyper.workspace = true 
 hyper-util.workspace = true