refactor(netapp): clean up test duplication and respect architectural boundaries

- Replace manager tests with focused orchestration and delegation tests
- Consolidate integration tests into single comprehensive file
- Remove duplicate test logic that violated service boundaries
- Manager tests now focus on service coordination, error propagation, and API contracts
- Integration tests focus on cross-service workflows and complex scenarios
- Eliminate ~70+ redundant tests while maintaining comprehensive coverage

This cleanup addresses architectural boundary violations where manager tests
were duplicating service-level logic, creating maintenance overhead and
unclear test responsibilities. The refactored tests properly separate
concerns between orchestration (manager), coordination (integration),
and business logic (services).

Author: skrobul