do not add to pub use in assists that insert a use statement
#5658
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closes #5657 , see issue for rationale
Initially I wrote a version of this that changed the signature of
insert_use_statementto take anOption<VisibilityKind>and only add to use statements with the same visibility, but that didn't make sense for any of the current uses ofinsert_use_statement(they all expected private visibility).