ui: push sql modules and proto descriptors through extension servers

Penultimate step for getting rid of internal user script.

Author: LalitMaganti

ui/src/frontend/is_internal_user_script_loader.ts

@@ -108,10 +108,4 @@ export function tryLoadIsInternalUserScript(app: AppImpl): void {
       );
     }),
   );
-  app.addProtoDescriptors(
-    scriptLoaded.then(({extraParsingDescriptors}) => extraParsingDescriptors),
-  );
-  app.addSqlPackages(
-    scriptLoaded.then(({extraSqlPackages}) => extraSqlPackages),
-  );
 }