[WIP] vmgstool copy-igvmfile integration tests

[gruvian]

Summary

Adds integration test coverage for vmgstool copy-igvmfile and the
load-IGVM-from-VMGS boot flow, plus a unit test for the IGVM size guard.

What this does

• Adds x64 copy_igvmfile_load_from_vmgs test modified to boot as an
  isolated SNP CVM.
• Adds negative integration tests (x64):
  • copy_igvmfile_overwrite
  • copy_igvmfile_corrupt_dll
  • copy_igvmfile_missing_data_path
  • copy_igvmfile_missing_resource
• Adds vmgstool unit test read_igvmfile_rejects_oversized_resource.

Testing

• Negative tests + unit test validated locally (clippy/doc/fmt clean).
• The booting SNP test needs CI/SNPvalidation. draft is open pending this

Open items (draft)

• Validate copy_igvmfile_load_from_vmgs on SNP-capable CI
• aarch64 coverage for negative tests if needed

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[Copilot]

Pull request overview

Copilot reviewed 25 out of 30 changed files in this pull request and generated 2 comments.