Rollup merge of #125258 - compiler-errors:static-if-no-lt, r=nnethercote

Resolve elided lifetimes in assoc const to static if no other lifetimes are in scope

Implements the change to elided lifetime resolution in *associated consts* subject to FCP here: https://github.com/rust-lang/rust/issues/125190#issue-2301532282

Specifically, walk the enclosing lifetime ribs in an associated const, and if we find no other lifetimes, then resolve to `'static`.

Also make it work for traits, but don't lint -- just give a hard error in that case.

compiler/rustc_lint/src/lints.rs

@@ -2873,6 +2873,8 @@ pub struct AssociatedConstElidedLifetime {
 
     pub code: &'static str,
     pub elided: bool,
+    #[note]
+    pub lifetimes_in_scope: MultiSpan,
 }
 
 #[derive(LintDiagnostic)]