test(hypervisors): add unit tests for HVT

[r0hansaxena]

Description

Adds unit tests for the HVT VMM backend, covering BuildExecCmd and the interface methods (UsesKVM, SupportsSharedfs, Path, Ok, PreExec). Tests verify memory configuration, networking, block devices, extra monitor args and the binary not found error case.

Related issues

• Part of Add more unit tests #96

How was this tested?

Ran unit tests locally:

go test ./pkg/unikontainers/hypervisors/ -v -run "TestHVT"

All 13 test cases passed. Full package tests also pass:

go test ./pkg/... ./internal/...

Linter passes locally (make lint, 0 issues).

LLM usage

Claude Sonnet 4.6 was used to assist with writing the tests. All code was reviewed and tested locally before submission.

Checklist

• I have read the contribution guide.
• The linter passes locally (make lint).
• The e2e tests of at least one tool pass locally (make test_ctr, make test_nerdctl, make test_docker, make test_crictl).
• If LLMs were used: I have read the llm policy.

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