fix [std_instead_of_core]: don't assume `alloc`/`core` are in the extern prelude#17296

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bushrat011899:std_instead_of_core_check_extern_prelude

Commits on Jun 23, 2026

fix: [std_instead_of_core] false positive for multi-imports
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fix:: [std_instead_of_core] should check extern crate prelude
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