Fix reporting of unused initializers in subgraphs (microsoft#19341)

### Description
<!-- Describe your changes. -->
Increment num_resolves_ inside the graph resolve finalization function
so the subgraphs have the same value.

This prevents incorrect output regarding removing unused initializers.

### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
microsoft#19141

onnxruntime/core/graph/graph.cc

@@ -2798,12 +2798,13 @@ Status Graph::Resolve(const ResolveOptions& options) {
                 graph.GraphProtoSyncNeeded(false);
             }
 
+            // set num_resolves_ here so the graph and any subgraphs all have the same value
+            ++graph.num_resolves_;
+
             return Status::OK(); };
 
   ORT_RETURN_IF_ERROR(ForThisAndAllSubgraphs(all_subgraphs, finalize_func));
 
-  ++num_resolves_;
-
   return Status::OK();
 }