community: fallback on core async atransform_documents method for `MarkdownifyTransformer` #34501

Job	Run time
build	12s
cd libs/community / make extended_tests #3.9	3m 18s
test-doc-imports	0s
cd libs/community / make extended_tests #3.12	3m 34s
cd libs/community / make lint #3.13	30s
cd libs/community / make lint #3.9	24s
cd libs/community / make test #3.13	1m 24s
cd libs/community / make test #3.9	1m 11s
cd libs/community / make test # pydantic: ~=2.10.0, python: 3.11,	43s
cd libs/community / make test # pydantic: ~=2.7.0, python: 3.11,	45s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.11	38s
cd libs/community / poetry run pytest -m compile tests/integration_tests #3.9	44s
cd libs/community / make test # pydantic: ~=2.8.0, python: 3.11,	44s
cd libs/community / make test # pydantic: ~=2.9.0, python: 3.11,	47s
CI Success	1s
	14m 55s

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