docs: Add OpenAIAssistantV2Runnable docstrings #32518

Job	Run time
build	13s
cd libs/community / make extended_tests #3.9	3m 9s
cd libs/community / make extended_tests #3.11	2m 59s
test-doc-imports	0s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.9	53s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.11	52s
cd libs/community / make lint #3.13	1m 26s
cd libs/community / make lint #3.9	1m 2s
cd libs/community / make test #3.13	1m 10s
cd libs/community / make test # pydantic: ~=2.7.0, python: 3.11,	44s
cd libs/community / make test #3.9	1m 7s
cd libs/community / make test # pydantic: ~=2.8.0, python: 3.11,	52s
cd libs/community / make test # pydantic: ~=2.9.0, python: 3.11,	47s
CI Success	1s
	15m 15s

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