[PSM Interop] Fix bad merge: NameError: name 'absltest' is not defined (#34128)

Cause: #34097

tools/run_tests/xds_k8s_test_driver/framework/xds_k8s_testcase.py

@@ -24,6 +24,7 @@ from types import FrameType
 from typing import Any, Callable, List, Optional, Tuple, Union
 
 from absl import flags
+from absl.testing import absltest
 from google.protobuf import json_format
 import grpc
 
@@ -73,9 +74,6 @@ _LoadBalancerAccumulatedStatsResponse = (
 _ChannelState = grpc_channelz.ChannelState
 _timedelta = datetime.timedelta
 ClientConfig = grpc_csds.ClientConfig
-# TODO(sergiitk): remove when pylint upgraded. Now it complains about
-#   "Undefined variable 'absltest'" in evaluate_test_config for some reason.
-_SkipTest = absltest.SkipTest  # pylint: disable=undefined-variable
 # pylint complains about signal.Signals for some reason.
 _SignalNum = Union[int, signal.Signals]  # pylint: disable=no-member
 _SignalHandler = Callable[[_SignalNum, Optional[FrameType]], Any]
@@ -101,7 +99,7 @@ def evaluate_test_config(
     )
     if not check(test_config):
         logger.info("Skipping %s", test_config)
-        raise _SkipTest(f"Unsupported test config: {test_config}")
+        raise absltest.SkipTest(f"Unsupported test config: {test_config}")
 
     logger.info("Detected language and version: %s", test_config)
     return test_config