Add unit tests for virt-v2v conversion helper functions

[coderabbitai]

Description

Unit tests are needed for the new helper functions introduced in PR #4509 for separating virt-v2v conversion and inspection extra arguments.

Missing Test Coverage

The following functions in pkg/virt-v2v/conversion/conversion.go lack unit tests:

• addConversionExtraArgs
• addInspectorExtraArgs
• addVirtV2vVsphereArgsForInspection

Context

These functions were introduced to separate extra arguments for conversion (VIRT_V2V_EXTRA_ARGS) from inspection (VIRT_V2V_INSPECTOR_EXTRA_ARGS), ensuring that conversion-specific args (e.g., --parallel) are not incorrectly passed to the inspector.

Unit tests should verify:

1. Extra args are correctly applied when non-nil
2. No args are added when nil
3. The separation between conversion and inspection paths is maintained

References

• PR: MTV-4454 | Separate extra args for virt-v2v conversion and inspection #4509
• Review comment: MTV-4454 | Separate extra args for virt-v2v conversion and inspection #4509 (comment)
• Requested by: @yaacov