[server] add tests and fix passing a custom generation_config (#39230)

* add tests; fix passing a custom generation_config

* tool integration test

* add install step

* add accelerate as dep to serving

* add todo

.circleci/create_circleci_config.py

@@ -303,7 +303,7 @@ non_model_job = CircleCIJob(
     docker_image=[{"image": "huggingface/transformers-torch-light"}],
     # networkx==3.3 (after #36957) cause some issues
     # TODO: remove this once it works directly
-    install_steps=["uv venv && uv pip install ."],
+    install_steps=["uv venv && uv pip install .[serving]"],
     marker="not generate",
     parallelism=6,
 )