Add test_connection method to KubernetesHook

providers/cncf/kubernetes/src/airflow/providers/cncf/kubernetes/hooks/kubernetes.py

@@ -140,7 +140,8 @@ def get_ui_field_behaviour(cls) -> dict[str, Any]:
 
     def __init__(
         self,
-        conn_id: str | None = default_conn_name,
+        conn_id: str | None = None,
+        kubernetes_conn_id: str | None = default_conn_name,
         client_configuration: client.Configuration | None = None,
         cluster_context: str | None = None,
         config_file: str | None = None,
@@ -149,7 +150,7 @@ def __init__(
         disable_tcp_keepalive: bool | None = None,
     ) -> None:
         super().__init__()
-        self.conn_id = conn_id
+        self.conn_id = conn_id or kubernetes_conn_id
         self.client_configuration = client_configuration
         self.cluster_context = cluster_context
         self.config_file = config_file
@@ -706,6 +707,14 @@ def get_yaml_content_from_file(kueue_yaml_url) -> list[dict]:
 
         return list(yaml.safe_load_all(response.text))
 
+    def test_connection(self):
+        try:
+            conn = self.get_conn()
+            version: client.VersionInfo = client.VersionApi(conn).get_code()
+            return True, f"Connection successful. Version Info: {version.to_dict()}"
+        except Exception as e:
+            return False, str(e)
+
 
 def _get_bool(val) -> bool | None:
     """Convert val to bool if can be done with certainty; if we cannot infer intention we return None."""