replace all LANGCHAIN_ flags with LANGSMITH_ flags (#29120) #36188

Job	Run time
build	10s
cd ${{ matrix.job-configs.working-directory }} / make extended_tests #${{ matrix.job-configs.python-version }}	0s
cd . / make lint #3.9	1m 58s
cd libs/cli / poetry run pytest -m compile tests/integration_tests #3.13	24s
cd libs/cli / poetry run pytest -m compile tests/integration_tests #3.9	23s
cd . / make lint #3.12	1m 47s
cd libs/cli / make lint #3.13	29s
cd libs/cli / make lint #3.9	24s
cd libs/cli / make test #3.13	1m 15s
cd libs/cli / make test #3.9	1m 24s
test-doc-imports (3.12) / check doc imports #3.12	1m 51s
cd libs/cli / make test # pydantic: ~=2.10.0, python: 3.11,	1m 3s
cd libs/cli / make test # pydantic: ~=2.5.0, python: 3.11,	1m 3s
cd libs/cli / make test # pydantic: ~=2.6.0, python: 3.11,	1m 8s
cd libs/cli / make test # pydantic: ~=2.7.0, python: 3.11,	1m 7s
cd libs/cli / make test # pydantic: ~=2.8.0, python: 3.11,	1m 6s
cd libs/cli / make test # pydantic: ~=2.9.0, python: 3.11,	1m 4s
CI Success	1s
	16m 37s

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