Revert "Make PROC_MACRO_DERIVE_RESOLUTION_FALLBACK a hard error"

This reverts commit 7d82cadd97.

I am doing this to buy us some time with respect to issue #106337 w.r.t. the
1.67 release.

compiler/rustc_resolve/src/lib.rs

@@ -105,7 +105,9 @@ enum Scope<'a> {
     DeriveHelpersCompat,
     MacroRules(MacroRulesScopeRef<'a>),
     CrateRoot,
-    Module(Module<'a>),
+    // The node ID is for reporting the `PROC_MACRO_DERIVE_RESOLUTION_FALLBACK`
+    // lint if it should be reported.
+    Module(Module<'a>, Option<NodeId>),
     MacroUsePrelude,
     BuiltinAttrs,
     ExternPrelude,
@@ -1591,7 +1593,7 @@ impl<'a> Resolver<'a> {
 
         self.visit_scopes(ScopeSet::All(TypeNS, false), parent_scope, ctxt, |this, scope, _, _| {
             match scope {
-                Scope::Module(module) => {
+                Scope::Module(module, _) => {
                     this.traits_in_module(module, assoc_item, &mut found_traits);
                 }
                 Scope::StdLibPrelude => {