MPT-18394 Add Helpdesk Cases API services with unit and e2e test coverage

[jentyk]

Summary

• add CasesService and AsyncCasesService under Helpdesk with spec endpoints for list/get/create/update and state transitions: query, process, complete
• wire new .cases accessors into sync and async Helpdesk modules
• add unit tests for method availability, transition request/response behavior (with and without payload), and absence of delete
• add e2e test suite scaffolding for sync/async cases flows (list/get/create/update/query/process/complete/not found)

Testing

• make check-all
• e2e tests: Not run (not requested)

Closes MPT-18394

Release Notes:

• Added CasesService and AsyncCasesService for Helpdesk resource management with support for list, get, create, and update operations
• Implemented three state transition methods on both services: query, process, and complete for managing case workflows
• Integrated .cases property accessors into Helpdesk and AsyncHelpdesk modules for easy service access
• Added comprehensive unit tests covering method availability, transition request/response handling with and without payloads, and verification of absent delete method
• Added end-to-end test suite scaffolding for both synchronous and asynchronous flows covering create, list, get, update, and state transitions (currently marked as skipped pending MPT-19124 completion)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud