Add cpu and memory to covered resources

Author: wstcliyu

src/xpk/core/kueue.py

@@ -469,7 +469,7 @@ def get_kueue_covered_resources_config(
     A string of Kueue covered resources configuration.
   """
   config_format = """
-  - coveredResources: ["{resource_type}"]
+  - coveredResources: ["{resource_type}", "cpu", "memory"]
     flavors:
     - name: {cluster_hardware_name}
       resources: