[ROCm][CI][PD] Add Hybrid SSM integration tests to CI (#37924)

Signed-off-by: Andreas Karatzas <akaratza@amd.com>

.buildkite/test-amd.yaml

@@ -1387,6 +1387,21 @@ steps:
   - CROSS_LAYERS_BLOCKS=True ROCM_ATTN=1 bash v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
 
 
+- label: Hyrbid SSM NixlConnector PD accuracy tests (4 GPUs) # TBD
+  timeout_in_minutes: 180
+  mirror_hardwares: [amdexperimental, amdproduction, amdgfx90anightly, amdmi250]
+  agent_pool: mi250_4
+  num_gpus: 4
+  working_dir: "/vllm-workspace/tests"
+  source_file_dependencies:
+  - vllm/distributed/kv_transfer/kv_connector/v1/nixl_connector.py
+  - tests/v1/kv_connector/nixl_integration/
+  - vllm/platforms/rocm.py
+  commands:
+  - uv pip install --system -r /vllm-workspace/requirements/kv_connectors_rocm.txt
+  - HYBRID_SSM=1 ROCM_ATTN=1 bash v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
+
+
 - label: Distributed Tests (2 GPUs)(H100-MI250) # TBD
   timeout_in_minutes: 180
   mirror_hardwares: [amdexperimental, amdproduction, amdgfx90anightly, amdmi250]