SRE-2386: use newest ARC

[lilfrou]

Summary by Sourcery

CI:

• Update the CI workflow to run unit tests on the 'utility-staging-amd64' environment instead of 'ubuntu-latest'.

[linear]

SRE-2386 Migrate GitHub Actions to actions-runner-controller Staging Part 2

[sourcery-ai]

Reviewer's Guide by Sourcery

The PR updates the GitHub Actions workflow to use a custom runner (utility-staging-amd64) instead of the default ubuntu-latest runner for unit tests.

File-Level Changes

Change	Details	Files
Updated GitHub Actions runner configuration for unit tests	Replaced default ubuntu-latest runner with utility-staging-amd64 custom runner	.github/workflows/test.yml

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[sourcery-ai]

Hey @lilfrou - I've reviewed your changes - here's some feedback:

Overall Comments:

• Please provide more context about this change: Why are we switching to a custom runner? What testing has been done to verify all required dependencies are available on utility-staging-amd64?
• The 'staging' designation in the runner name suggests this might be a pre-production environment. Please confirm if this runner is ready for production use.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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