Add minimal test for basic hackathon operations and enhance test utilities
- Introduced a new test module for hackathon-related functionality. - Implemented a basic test for creating a hackathon using a mock repository. - Enhanced the test utilities in `lib.rs` for better request handling and response extraction. - Added a `ServiceClient` struct to facilitate HTTP requests in tests. - Created a `RequestBuilder` to streamline building and sending requests with headers and JSON bodies.
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