Rollup merge of #109003 - GuillaumeGomez:useless-anonymous-reexport-lint, r=cjgillot

Add `useless_anonymous_reexport` lint

This is a follow-up of https://github.com/rust-lang/rust/pull/108936. We once again show all anonymous re-exports in rustdoc, however we also wanted to add a lint to let users know that it very likely doesn't have the effect they think it has.

compiler/rustc_lint/src/lints.rs

@@ -1528,3 +1528,11 @@ pub struct UnusedAllocationDiag;
 #[derive(LintDiagnostic)]
 #[diag(lint_unused_allocation_mut)]
 pub struct UnusedAllocationMutDiag;
+
+#[derive(LintDiagnostic)]
+#[diag(lint_useless_anonymous_reexport)]
+#[note]
+pub struct UselessAnonymousReexportDiag {
+    pub article: &'static str,
+    pub desc: &'static str,
+}