[Bugfix] Use count() in queryTable system UDF (#39882)

GitOrigin-RevId: 2f33688f9f3bed30ebac8e9ce2b0aa11a32f305c

Author: jordanhunt22

npm-packages/system-udfs/convex/_system/cli/queryTable.ts

@@ -7,7 +7,7 @@ import { v } from "convex/values";
 export default queryGeneric({
   args: { tableName: v.string() },
   handler: async ({ db }, { tableName }) => {
-    await db.query(tableName as TableNames).collect();
+    await db.query(tableName as TableNames).count();
     return Math.random();
   },
 });