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6f0b6627 - [red-knot] Migrate `is_fully_static`/`is_single_valued`/`is_singleton` unit tests to Markdown tests (#15533)

[red-knot] Migrate `is_fully_static`/`is_single_valued`/`is_singleton` unit tests to Markdown tests (#15533) ## Summary Part of #15397. ## Test Plan Markdown tests. --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>