fix(rest-api): expose last Scout version

[kfelternv]

Machine responses omit the last Scout version already stored in Core metadata, so the REST API and nicocli cannot show it. This exposes lastScoutObservedVersion from the current status field with the deprecated top-level value as a compatibility fallback.

Related issues

• feat: expose last seen scout image version for a machine #1614
• NVBug 6504114

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

Passed targeted REST model, nicocli spec/output, simple and generated SDK, OpenAPI lint, and Go vet checks.

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