[scheduler][test] Initialize testing "infra"

[LukasTy]

Closes https://github.com/mui/mui-x/issues/17912.

~I'm exploring the addition of conformance tests to the primitives and will open a separate PR if the exploration has meaningful results.~

Created a PR (https://github.com/LukasTy/mui-x/pull/4) on my fork with the diff. Will open the PR on this repo once this one is merged.

[github-actions[bot]]

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[mui-bot]

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