fix: Validate first yielded value in orchestrator run() method#164

YunchuWang wants to merge 2 commits intomainmicrosoft/durabletask-js:mainfrom

copilot-finds/bug/validate-first-yield-in-orchestrator-runmicrosoft/durabletask-js:copilot-finds/bug/validate-first-yield-in-orchestrator-runCopy head branch name to clipboard