Fix flaky LangGraph timeout tests (#1495) #5022

Job	Run time
test-latest-deps	9m 4s
cloud-test	1m 47s
check-protos	7m 27s
build-lint-test (3.10, macos-intel)	23m 25s
features-tests / test	8m 18s
build-lint-test (3.10, ubuntu-arm)	10m 50s
build-lint-test (3.14, ubuntu-latest)	17m 28s
build-lint-test (3.14, macos-intel)	23m 19s
build-lint-test (3.14, windows-latest)	18m 15s
build-lint-test (3.10, macos-arm)	9m 23s
build-lint-test (3.10, ubuntu-latest)	13m 17s
build-lint-test (3.10, windows-latest)	18m 32s
build-lint-test (3.14, macos-arm)	10m 6s
build-lint-test (3.14, ubuntu-arm)	10m 36s
	3h 1m 47s

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