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58a68f1b - [ty] Fall back to `Divergent` for deeply nested specializations (#20988)

[ty] Fall back to `Divergent` for deeply nested specializations (#20988) ## Summary Fall back to `C[Divergent]` if we are trying to specialize `C[T]` with a type that itself already contains deeply nested specialized generic classes. This is a way to prevent infinite recursion for cases like `self.x = [self.x]` where type inference for the implicit instance attribute would not converge. closes https://github.com/astral-sh/ty/issues/1383 closes https://github.com/astral-sh/ty/issues/837 ## Test Plan Regression tests.