Temporarily disable flaky qwen3 cp test in CI (#21178)

test/registered/4-gpu-models/test_qwen3_30b.py

@@ -11,8 +11,11 @@ from sglang.test.test_utils import (
     popen_launch_server,
 )
 
-register_cuda_ci(est_time=300, suite="stage-c-test-4-gpu-h100")
-
+register_cuda_ci(
+    est_time=300,
+    suite="stage-c-test-4-gpu-h100",
+    disabled="Temporarily disable the flaky test.",
+)
 QWEN3_30B_MODEL_PATH = "Qwen/Qwen3-30B-A3B-FP8"
 
 GSM8K_BASELINE_ACCURACY = 0.85