community: fallback on core async atransform_documents method for `MarkdownifyTransformer` #34513

Job	Run time
build	12s
cd libs/community / make extended_tests #3.9	1m 32s
test-doc-imports	0s
cd libs/community / make extended_tests #3.12	1m 40s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.9	34s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.11	31s
cd libs/community / make lint #3.13	55s
cd libs/community / make lint #3.9	55s
cd libs/community / make test #3.13	1m 19s
cd libs/community / make test #3.9	53s
cd libs/community / make test # pydantic: ~=2.10.0, python: 3.11,	40s
cd libs/community / make test # pydantic: ~=2.7.0, python: 3.11,	36s
cd libs/community / make test # pydantic: ~=2.8.0, python: 3.11,	35s
cd libs/community / make test # pydantic: ~=2.9.0, python: 3.11,	46s
CI Success	1s
	11m 9s

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