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Rollup merge of #153452 - GuillaumeGomez:migrate-diag, r=JonathanBrouwer
Cleanup unused diagnostic emission methods
Part of https://github.com/rust-lang/rust/issues/153099.
To remove `lint_level`, we need to remove all functions calling it. One of them is `TyCtxt::node_span_lint`, so removing it.
r? @JonathanBrouwer
