ci: Test for unused dependencies

[JonathanWoollett-Light]

Changes

Adds a test for unused cargo dependencies.

Reason

Prevents including unused dependencies see #4113 (comment).

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

• If a specific issue led to this PR, this PR closes the issue.
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• API changes follow the Runbook for Firecracker API changes.
• User-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.
• New TODOs link to an issue.
• Commits meet contribution quality standards.

---

• This functionality cannot be added in rust-vmm.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.98%. Comparing base (77d3704) to head (c5a315d).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4117   +/-   ##
=======================================
  Coverage   83.98%   83.98%           
=======================================
  Files         251      251           
  Lines       27889    27889           
=======================================
  Hits        23422    23422           
  Misses       4467     4467           

Flag	Coverage Δ
5.10-c5n.metal	84.55% <ø> (ø)
5.10-m5n.metal	84.53% <ø> (ø)
5.10-m6a.metal	83.82% <ø> (ø)
5.10-m6g.metal	80.68% <ø> (ø)
5.10-m6i.metal	84.53% <ø> (+<0.01%)	⬆️
5.10-m7g.metal	80.68% <ø> (ø)
6.1-c5n.metal	84.55% <ø> (ø)
6.1-m5n.metal	84.54% <ø> (ø)
6.1-m6a.metal	83.82% <ø> (ø)
6.1-m6g.metal	80.68% <ø> (ø)
6.1-m6i.metal	84.52% <ø> (ø)
6.1-m7g.metal	80.68% <ø> (+<0.01%)	⬆️

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[JonathanWoollett-Light]

Blocked on docker changes from: #4089

[roypat]

Unblocked :)

[JonathanWoollett-Light]

#4089 merged, unblocked.

[bchalios]

Could you please break this down to two commits, one that adds the test (test, Docker changes) and one that removes the unused dependencies?

Also, there are here, seemingly, completely unrelated changes (the ones in the documentation). Please drop these and add them in a different PR.

[JonathanWoollett-Light]

Could you please break this down to two commits, one that adds the test (test, Docker changes) and one that removes the unused dependencies?

I've updated the PR breaking it down into 4 commits.

Also, there are here, seemingly, completely unrelated changes (the ones in the documentation). Please drop these and add them in a different PR.

These are required by the updated version of markdown lint. mdl is a ruby dependency so we don't have a lock file for it.