fix: Rare failure in pause resume test

[JackThomson2]

Changes

Test with 1 vCPU when running the KVMCLOCK_CTRL tests so we don't fail on intermittent issue with clock.

Confirmed with the KVMCLOCK_CTR call removed the test still fails after the update.

Reason

...

License Acceptance

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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
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• I have linked an issue to every new TODO.

---

• This functionality cannot be added in rust-vmm.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.16%. Comparing base (567b1ea) to head (e033b28).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5011   +/-   ##
=======================================
  Coverage   83.16%   83.16%           
=======================================
  Files         245      245           
  Lines       26647    26647           
=======================================
  Hits        22161    22161           
  Misses       4486     4486           

Flag	Coverage Δ
5.10-c5n.metal	83.61% <ø> (ø)
5.10-m5n.metal	83.59% <ø> (ø)
5.10-m6a.metal	82.80% <ø> (ø)
5.10-m6g.metal	79.59% <ø> (ø)
5.10-m6i.metal	83.58% <ø> (?)
5.10-m7g.metal	79.59% <ø> (ø)
6.1-c5n.metal	83.61% <ø> (ø)
6.1-m5n.metal	83.59% <ø> (-0.01%)	⬇️
6.1-m6a.metal	82.80% <ø> (ø)
6.1-m6g.metal	79.59% <ø> (ø)
6.1-m6i.metal	83.58% <ø> (ø)
6.1-m7g.metal	79.59% <ø> (ø)

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