chore(langgraph): test errors thrown from conditional edges #2118

Job	Run time
Build	2m 8s
check-readmes-synced	4s
Check linting	2m 5s
Check formatting	1m 43s
Validate Deno and Node dependencies in sync	8s
Unit Tests (ubuntu-latest, 18.x)	1m 31s
validate-new-notebooks	5s
Unit Tests (ubuntu-latest, 20.x)	1m 34s
Unit Tests (ubuntu-latest, 22.4.1)	2m 24s
Unit Tests (windows-latest, 22.4.1)	4m 27s
Unit Tests (macos-latest, 22.4.1)	1m 47s
	17m 56s

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