fix: Extract problematic node location to YAML (GoogleCloudPlatform#1288)

Previously, the `problematic_node_pool_info` utilized a hardcoded suffix (`-c`) to intentionally corrupt the location string for error-path verification. However, this approach could lead to a non-existent location when the configurations in the YAML file changed. This update resolves the issue by removing the hardcoded suffix and defining the complete problematic node location directly within the YAML file.

Co-authored-by: Jim Tseng <jim.tseng@cienet.com>

Author: yuna-tzeng

dags/tpu_observability/node_pool_status.py

@@ -34,6 +34,7 @@
 )
 from dags.tpu_observability.utils import node_pool_util as node_pool
 from dags.tpu_observability.utils.node_pool_util import NodeOperationSpec
+from xlml.apis import gcs
 
 DAG_ID = "gke_node_pool_status"
 DAGRUN_TIMEOUT = get_dag_timeout(DAG_ID)
@@ -88,7 +89,13 @@
       )
 
       problematic_node_pool_info = copy.deepcopy(node_pool_info)
-      problematic_node_pool_info.location = f"{node_pool_info.location}-c"
+      yaml_config = gcs.load_yaml_from_gcs(GCS_CONFIG_PATH)
+      wrong_node_loc = (
+          yaml_config.get("dag", {})
+          .get(DAG_ID, {})
+          .get("wrong_node_location", "asia-east1-c")
+      )
+      problematic_node_pool_info.node_location = wrong_node_loc
       problematic_node_pool_info.node_pool_name = (
           f"{node_pool_info.node_pool_name}-x"
       )