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.

imphnen-iam/src/v1/roles/roles_schema.rs

@@ -46,7 +46,7 @@ impl RolesSchema {
 				.permissions
 				.as_ref()
 				.unwrap_or(&vec![])
-				.into_iter()
+				.iter()
 				.filter_map(|perm| {
 					perm.as_ref().and_then(|p| p.id.as_ref().map(|id| make_thing_from_enum(ResourceEnum::Permissions, &id.id.to_raw())))
 				})