fix: remove duplicated function

Author: pawelpaszki

tests/e2e/support.py

@@ -2111,30 +2111,3 @@ def setup_byoidc_user_context(username, password):
     except Exception as e:
         print(f"Error setting up BYOIDC user context: {e}")
         return False
-
-
-def verify_authentication_stability():
-    """
-    Verify that authentication is stable and working before critical operations.
-    Simplified version for kube-authkit.
-
-    Returns:
-        bool: True if authentication is stable, False otherwise
-    """
-    try:
-        # Test basic Kubernetes API access
-        k8s_client = initialize_kubernetes_client_standalone()
-        if not k8s_client:
-            print("WARNING: Could not get authenticated Kubernetes client")
-            return False
-
-        # Test API connectivity with a simple call
-        v1 = client.CoreV1Api(k8s_client)
-        v1.list_namespace(limit=1)
-
-        print("✓ Authentication stability verified")
-        return True
-
-    except Exception as e:
-        print(f"WARNING: Authentication stability check failed: {e}")
-        return False