Attempt to fix Turbopack error

I have no idea what I'm doing in this part of the
codebase but someone suggested this might work?
Let's see.

Author: acdlite

crates/next-core/src/next_import_map.rs

@@ -342,6 +342,10 @@ pub async fn get_next_server_import_map(
         .resolved_cell();
 
     import_map.insert_exact_alias("next/dist/server/require-hook", external);
+    import_map.insert_exact_alias(
+        "private-next-instrumentation-client",
+        ImportMapping::Ignore.resolved_cell(),
+    );
     match ty {
         ServerContextType::Pages { .. }
         | ServerContextType::PagesData { .. }