Only make inferences from tuple types of right arity #22850
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With this PR we only make inferences between tuple types of matching arity. Since #17765 tuple types with different arity are known never to be assignment compatible, so there's no point in making inferences between them, and when the inference target is a union type it actually degrades the quality of inferences.
Fixes #22562.
Fixes #22563.
Fixes #22564.