community: Add deprecation warning for GigaChat integration in langchain-community #33808

Job	Run time
build	15s
cd libs/community / make extended_tests #3.9	1m 37s
cd libs/community / make extended_tests #3.11	1m 40s
cd . / make lint #3.9	1m 10s
cd . / make lint #3.12	1m 31s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.9	33s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.11	27s
cd libs/community / make lint #3.13	58s
cd libs/community / make lint #3.9	47s
cd libs/community / make test #3.13	1m 17s
cd libs/community / make test #3.9	55s
test-doc-imports (3.12) / check doc imports #3.12	1m 0s
cd libs/community / make test # pydantic: ~=2.7.0, python: 3.11,	34s
cd libs/community / make test # pydantic: ~=2.8.0, python: 3.11,	34s
cd libs/community / make test # pydantic: ~=2.9.0, python: 3.11,	34s
CI Success	1s
	13m 53s

Provide feedback