test(popular-containters): use ecr instead of docker.io

[kalyazin]

Changes

Use ECR instead of docker.io to pull popular container images for tests.

Reason

This is to avoid rate limiter hits on the DockerHub side.

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.91%. Comparing base (504b94d) to head (fc29dde).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5284      +/-   ##
==========================================
+ Coverage   82.86%   82.91%   +0.05%     
==========================================
  Files         250      250              
  Lines       26902    26902              
==========================================
+ Hits        22292    22306      +14     
+ Misses       4610     4596      -14     

Flag	Coverage Δ
5.10-c5n.metal	83.35% <ø> (ø)
5.10-m5n.metal	83.34% <ø> (ø)
5.10-m6a.metal	82.56% <ø> (ø)
5.10-m6g.metal	79.17% <ø> (ø)
5.10-m6i.metal	83.34% <ø> (ø)
5.10-m7a.metal-48xl	82.55% <ø> (?)
5.10-m7g.metal	79.17% <ø> (ø)
5.10-m7i.metal-24xl	83.30% <ø> (?)
5.10-m7i.metal-48xl	83.30% <ø> (?)
5.10-m8g.metal-24xl	79.17% <ø> (?)
5.10-m8g.metal-48xl	79.17% <ø> (?)
6.1-c5n.metal	83.40% <ø> (+<0.01%)	⬆️
6.1-m5n.metal	83.40% <ø> (+<0.01%)	⬆️
6.1-m6a.metal	82.61% <ø> (ø)
6.1-m6g.metal	?
6.1-m6i.metal	83.38% <ø> (-0.01%)	⬇️
6.1-m7a.metal-48xl	82.60% <ø> (?)
6.1-m7g.metal	79.17% <ø> (ø)
6.1-m7i.metal-24xl	83.41% <ø> (?)
6.1-m7i.metal-48xl	83.41% <ø> (?)
6.1-m8g.metal-24xl	79.17% <ø> (?)
6.1-m8g.metal-48xl	79.17% <ø> (?)

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[pb8o]

hmm unrelated for this PR but maybe we should include 25.04 and drop 24.10 which will become unsupported in a few days.

Or ubuntu:latest to do that automatically from now on.