[CI] Move applicable tests to CPU (#24080)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/test_outputs.py

@@ -1,8 +1,12 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
+import pytest
+
 from vllm.outputs import RequestOutput
 
+pytestmark = pytest.mark.cpu_test
+
 
 def test_request_output_forward_compatible():
     output = RequestOutput(request_id="test_request_id",