Rollup merge of #100674 - PragmaTwice:mig-typeck-unused-crate-diag, r=davidtwco

Migrate lint reports in typeck::check_unused to LintDiagnostic

In this PR, I migrate two lint reports in `typeck::check_unused` by `LintDiagnostic`, all of which is about extern crates.

```@rustbot``` label +A-translation
r? rust-lang/diagnostics

Author: matthiaskrgr