[CI] Actually run tests/kv_transfer/test_disagg.py in CI (#17555)

Signed-off-by: mgoin <mgoin64@gmail.com>

tests/kv_transfer/test_disagg.py

@@ -14,8 +14,8 @@ import torch
 # Fixture to set up environment variables and teardown servers after tests
 @pytest.fixture(scope="module", autouse=True)
 def setup_servers():
-    if torch.cuda.device_count() < 4:
-        pytest.skip("Skipping test: fewer than 4 GPUs available")
+    if torch.cuda.device_count() < 2:
+        pytest.skip("Skipping test: fewer than 2 GPUs available")
 
     # Set up environment variables
     VLLM_HOST_IP = subprocess.check_output("hostname -I | awk '{print $1}'",