ci: add runs-on.yml that points to prebuilt AMI

[a10y]

We need to merge this first before we can do #5618

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.23%. Comparing base (0ca315e) to head (c5f3114).
⚠️ Report is 1 commits behind head on develop.

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