Draft: Resolve "Decouple kernel tests from `CanvasTestSetup`: painful to work on, and VERY slow"

Wim Leersrequested to merge
3531679-decouple-kerneltests-from-canvastestsetup into 1.x

🚨 NOT ready for review. Wanted to see the test results on CI.

AI-Generated: Yes.

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Closes #3531679

Edited by Wim Leers

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