Rollup merge of #98267 - compiler-errors:suggest-wildcard-arm, r=oli-obk

Don't omit comma when suggesting wildcard arm after macro expr

* Also adds `Span::eq_ctxt` to consolidate the various usages of `span.ctxt() == other.ctxt()`
* Also fixes an unhygenic usage of spans which caused the suggestion to render weirdly when we had one arm match in a macro
* Also always suggests a comma (i.e. even after a block) if we're rendering a wildcard arm in a single-line match (looks prettier 🌹)

Fixes #94866

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -1894,7 +1894,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
         let names = rib
             .bindings
             .iter()
-            .filter(|(id, _)| id.span.ctxt() == label.span.ctxt())
+            .filter(|(id, _)| id.span.eq_ctxt(label.span))
             .map(|(id, _)| id.name)
             .collect::<Vec<Symbol>>();