Fix missing assignment and incorrect context in hcs.cpp debug logging

[Copilot]

Summary of the Pull Request

Fixes two bugs introduced in the HCS debug logging PR:

• GetSchemaVersion() computed but never stored the schema version, always returning {0, 0}
• RevokeVmAccess() used wrong execution context (HNS instead of HCS)

PR Checklist

• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Changes

• GetSchemaVersion(): Added missing assignment of computed majorVersion and minorVersion to static g_schemaVersion variable after calculation loop
• RevokeVmAccess(): Changed ExecutionContext from Context::HNS to Context::HCS to match the HCS API being called (HcsRevokeVmAccess)

Both issues were logic errors - computed values not stored and incorrect context type for the API category.

Validation Steps Performed

• Code formatting validated with clang-format
• Automated code review completed with no issues

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