test(conftest): move (not copy) vm artifacts

[kalyazin]

Changes

Move instead of copying VM artifacts (like mem snapshot files).

Reason

This is to keep free space in the /srv filesystem.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the Apache 2.0 license. For more information on following Developer
Certificate of Origin and signing off your commits, please check
CONTRIBUTING.md.

PR Checklist

• I have read and understand CONTRIBUTING.md.
• I have run tools/devtool checkstyle to verify that the PR passes the
  automated style checks.
• I have described what is done in these changes, why they are needed, and
  how they are solving the problem in a clear and encompassing way.
• [ ] I have updated any relevant documentation (both in code and in the docs)
  in the PR.
• [ ] I have mentioned all user-facing changes in CHANGELOG.md.
• [ ] If a specific issue led to this PR, this PR closes the issue.
• [ ] When making API changes, I have followed the
  Runbook for Firecracker API changes.
• [ ] I have tested all new and changed functionalities in unit tests and/or
  integration tests.
• [ ] I have linked an issue to every new TODO.

---

• This functionality cannot be added in rust-vmm.

[Copilot]

Pull Request Overview

This PR updates the tests to move VM artifact files instead of copying them, ensuring that free space is preserved on the /srv filesystem.

• Replaces the call to shutil.copy with shutil.move to transfer VM artifacts.
• Limits file operations to only the backup functionality in test configuration for microvm setup.

Comments suppressed due to low confidence (1)

tests/conftest.py:340

• Switching from copying to moving files can introduce issues if subsequent code expects the original file at src. Please ensure that no side-effects occur due to the file being moved rather than copied.

shutil.move(src, dst)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.06%. Comparing base (e94b72b) to head (a97e539).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5119   +/-   ##
=======================================
  Coverage   83.06%   83.06%           
=======================================
  Files         250      250           
  Lines       26876    26876           
=======================================
  Hits        22324    22324           
  Misses       4552     4552           

Flag	Coverage Δ
5.10-c5n.metal	83.52% <ø> (ø)
5.10-m5n.metal	83.52% <ø> (ø)
5.10-m6a.metal	82.71% <ø> (-0.01%)	⬇️
5.10-m6g.metal	79.43% <ø> (ø)
5.10-m6i.metal	83.52% <ø> (+<0.01%)	⬆️
5.10-m7a.metal-48xl	82.72% <ø> (?)
5.10-m7g.metal	79.43% <ø> (ø)
6.1-c5n.metal	83.57% <ø> (+<0.01%)	⬆️
6.1-m5n.metal	83.56% <ø> (ø)
6.1-m6a.metal	82.76% <ø> (+<0.01%)	⬆️
6.1-m6g.metal	79.43% <ø> (+<0.01%)	⬆️
6.1-m6i.metal	83.56% <ø> (+<0.01%)	⬆️
6.1-m7a.metal-48xl	82.76% <ø> (?)
6.1-m7g.metal	79.43% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.