Added `nb-clean` to `pre-commit` (#8108)

.pre-commit-config.yaml

CHANGELOG.md

benchmarks/agent/agent_benchmark.ipynb

...core_modules/data_modules/index/index_progress_bars.ipynb

.../core_modules/data_modules/index/vector_store_guide.ipynb

docs/end_to_end_tutorials/structured_data/Airbyte_demo.ipynb

docs/examples/agent/Chatbot_SEC.ipynb

docs/examples/agent/multi_document_agents-v1.ipynb

docs/examples/agent/multi_document_agents.ipynb

docs/examples/agent/openai_agent.ipynb

docs/examples/agent/openai_agent_context_retrieval.ipynb

docs/examples/agent/openai_agent_query_cookbook.ipynb

docs/examples/agent/openai_agent_query_plan.ipynb

docs/examples/agent/openai_agent_retrieval.ipynb

docs/examples/agent/openai_agent_with_query_engine.ipynb

docs/examples/agent/openai_forced_function_call.ipynb

docs/examples/agent/react_agent.ipynb

docs/examples/agent/react_agent_with_query_engine.ipynb

docs/examples/analysis/PlaygroundDemo.ipynb

docs/examples/callbacks/AimCallback.ipynb