Need CI to stop cert tests from using the unit testing cluster

[cecille]

Summary Title:

Arithmetic operations are not supported in yaml, and somehow we're not always hitting these steps in the CI. That's a separate problem. Step 1 - let's lint for it. And also for UnitTesting, which apparently folks are using as a workaround

Description:

Need linter. Can use regex.
grep -E '(minValue|maxValue|value):\s*[a-zA-Z0-9.]+\s*[-+/]+\s[a-zA-Z0-9.]' src/app/tests/suites/certification/.yaml
grep -E 'cluster: "Unit Testing"' src/app/tests/suites/certification/.yaml

[cecille]

Update - arithmetic operations are supported if you writ them correctly (with a space). Terence is doing an update to support this better in the runner.

[cecille]

project-chip/connectedhomeip#33261