Backport config update timeout change to v1.38.x (#26276)

* Enable Traffic Director time tracer (#26111)

* Just update the timeout (#26223)

* Increase xds job timeouts (#26187)

* Revert grpc_xds_k8s job timeouts back to 120 mins (#26219)

* Revert grpc_xds_k8s_python timeout to 120mins (#26221)

Seems to have been inadvertently increased in #26187

Co-authored-by: Eric Gribkoff <ericgribkoff@google.com>
Co-authored-by: Yash Tibrewal <yashkt@google.com>

tools/internal_ci/linux/grpc_xds_k8s.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/grpc_xds_k8s.sh"
-timeout_mins: 360
+timeout_mins: 120
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"

tools/internal_ci/linux/grpc_xds_k8s_python.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/grpc_xds_k8s_python.sh"
-timeout_mins: 360
+timeout_mins: 120
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"

tools/run_tests/run_xds_tests.py

@@ -279,14 +279,23 @@ CLIENT_HOSTS = []
 if args.client_hosts:
     CLIENT_HOSTS = args.client_hosts.split(',')
 
+# Each of the config propagation in the control plane should finish within 600s.
+# Otherwise, it indicates a bug in the control plane. The config propagation
+# includes all kinds of traffic config update, like updating urlMap, creating
+# the resources for the first time, updating BackendService, and changing the
+# status of endpoints in BackendService.
+_WAIT_FOR_URL_MAP_PATCH_SEC = 600
+# In general, fetching load balancing stats only takes ~10s. However, slow
+# config update could lead to empty EDS or similar symptoms causing the
+# connection to hang for a long period of time. So, we want to extend the stats
+# wait time to be the same as urlMap patch time.
+_WAIT_FOR_STATS_SEC = _WAIT_FOR_URL_MAP_PATCH_SEC
+
 _DEFAULT_SERVICE_PORT = 80
 _WAIT_FOR_BACKEND_SEC = args.wait_for_backend_sec
 _WAIT_FOR_OPERATION_SEC = 1200
 _INSTANCE_GROUP_SIZE = args.instance_group_size
 _NUM_TEST_RPCS = 10 * args.qps
-_WAIT_FOR_STATS_SEC = 360
-_WAIT_FOR_VALID_CONFIG_SEC = 60
-_WAIT_FOR_URL_MAP_PATCH_SEC = 300
 _CONNECTION_TIMEOUT_SEC = 60
 _GCP_API_RETRIES = 5
 _BOOTSTRAP_TEMPLATE = """