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97acaaea - [ty] Fix stack overflow for self-referential `TypeOf` in annotations (#23407)

[ty] Fix stack overflow for self-referential `TypeOf` in annotations (#23407) ## Summary When a function references itself via `TypeOf` in a deferred annotation (`def foo(x: "TypeOf[foo]")`), the resulting `FunctionType` contains itself as a parameter type, forming a cycle. Closes https://github.com/astral-sh/ty/issues/2800.