Prompt for human feedback in LangGraph HITL sample #1291

Job	Run time
build-lint-test (3.10, windows-latest)	9m 39s
build-lint-test (3.10, ubuntu-latest)	6m 54s
build-lint-test (3.10, macos-intel)	12m 48s
build-lint-test (3.14, ubuntu-latest)	7m 5s
build-lint-test (3.10, macos-arm)	9m 53s
build-lint-test (3.14, macos-arm)	6m 54s
build-lint-test (3.14, windows-latest)	9m 15s
build-lint-test (3.14, macos-intel)	11m 1s
	1h 13m 29s

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