Specify supported cloud run langs/versions in is_supported

Author: sergiitk

tests/cloud_run_csm_inbound_test.py

@@ -18,18 +18,28 @@
 from typing_extensions import override
 
 from framework import xds_k8s_testcase
+from framework.helpers import skips
 from framework.test_app.runners.k8s import k8s_xds_client_runner
 from framework.test_cases import cloud_run_testcase
 
 logger = logging.getLogger(__name__)
 
+# Type aliases.
+_Lang: TypeAlias = skips.Lang
 _XdsTestServer: TypeAlias = xds_k8s_testcase.XdsTestServer
 _XdsTestClient: TypeAlias = xds_k8s_testcase.XdsTestClient
 KubernetesClientRunner: TypeAlias = k8s_xds_client_runner.KubernetesClientRunner
 ClientDeploymentArgs: TypeAlias = k8s_xds_client_runner.ClientDeploymentArgs
 
 
 class CloudRunCsmInboundTest(cloud_run_testcase.CloudRunXdsKubernetesTestCase):
+    @staticmethod
+    @override
+    def is_supported(config: skips.TestConfig) -> bool:
+        if config.client_lang is _Lang.CPP:
+            return config.version_gte("v1.71.x")
+        return False
+
     @override
     def initKubernetesClientRunner(self, **kwargs) -> KubernetesClientRunner:
         return super().initKubernetesClientRunner(