ci: use self-hosted KubeVirt runners for amd64 jobs

[mangelajo]

Switch E2E and pytest amd64/Linux jobs from ubuntu-24.04 to arc-runner-kubevirt, running on self-hosted KubeVirt VMs on the beast cluster. ARM64 and macOS jobs are unchanged.

[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: 3e2b8761-72a5-4054-913c-0d70c146c6e1

📥 Commits

Reviewing files that changed from the base of the PR and between a147739 and eb6328c.

📒 Files selected for processing (2)

• .github/workflows/e2e.yaml
• .github/workflows/python-tests.yaml

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📝 Walkthrough

Walkthrough

This PR updates GitHub Actions workflow runner configurations across the E2E and Python test pipelines, migrating from ubuntu-24.04 to arc-runner-kubevirt for job execution while maintaining the existing matrix structures for architecture coverage.

Changes

Runner Infrastructure Migration

Layer / File(s)	Summary
E2E workflow jobs runner migration .github/workflows/e2e.yaml	Build controller and operator image jobs, build-python-wheels, e2e-tests, and compatibility jobs switch from ubuntu-24.04 to arc-runner-kubevirt in their job matrices and runner configurations.
Python tests workflow runner migration .github/workflows/python-tests.yaml	Pytest-matrix job updates its runs-on strategy from ubuntu-24.04 to arc-runner-kubevirt while retaining macos-15.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 In the CI clouds we hop and bound,
New runners found, a better ground,
Arc-runner-kubevirt, swift and true,
Let tests and builds run spry and new! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely summarizes the main change: switching CI runners from ubuntu-24.04 to self-hosted KubeVirt runners for amd64 jobs.
Description check	✅ Passed	The description clearly explains the changeset: switching E2E and pytest amd64/Linux jobs to self-hosted KubeVirt runners while keeping ARM64 and macOS jobs unchanged.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kubevirt-runners

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[kirkbrauer]

This looks good to me, hopefully we get quite a speedup here!

[mangelajo]

I am experimenting @kirkbrauer , the operator I am trying for the github actions in K8s + kubevirt seems to be a bit slow to rotate VMs, and grab jobs. Unless we get to improve that we would have to look for an alternative option