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37ae52fa - [ty] Skip global search for references if identifier is not externally visible (#25033)

[ty] Skip global search for references if identifier is not externally visible (#25033) ## Summary Part of https://github.com/astral-sh/ty/issues/1720 to improve the find references performance. Avoid searching for cross-file references if the identifier isn't visible across modules. For example, avoid searching for cross-file references for function scoped variables. ```py def test(): x = 10 print(x<CURSOR) ``` `x` can never be visible outside of the function.