migration: Skip vhostuser disk migration test on aarch64

[hholoubk]

Summary

• Add no aarch64 to migration_with_vhostuser.cfg, matching the existing no ppc64le exclusion
• RHEL qemu-kvm-*el*.aarch64 does not advertise vhost-user-blk, so the test always fails at VM define with "vhostuser disk is not supported with this QEMU binary"

Test plan

• Verify avocado-vt lists migration.migration_with_disk.migration_with_vhostuser.with_precopy on x86_64
• Verify the test is skipped on aarch64 (not listed / SKIP in CI)
• Re-run cross_migration_cross_feature on aarch64 after merge — vhostuser error should disappear

Summary by CodeRabbit

• Tests
  • Updated migration test configuration to exclude ARM-based architectures from disk migration scenarios.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 878670ae-c981-4f41-b8d6-c9c1dac98671

📥 Commits

Reviewing files that changed from the base of the PR and between c96ab65 and f54491e.

📒 Files selected for processing (1)

• libvirt/tests/cfg/migration/migration_with_disk/migration_with_vhostuser.cfg

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Walkthrough

A single no aarch64 architecture exclusion directive is added to libvirt/tests/cfg/migration/migration_with_disk/migration_with_vhostuser.cfg at line 35. This causes the vhost-user disk migration test to be skipped when running on aarch64 architecture.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: adding an aarch64 architecture exclusion to a vhost-user disk migration test configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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