fix(langchain): propagate trace name metadata#1626

hassiebp merged 1 commit intomainlangfuse/langfuse-python:mainfrom

hassieb/lfe-9178-bugsdk-python-langchaincallbackhandler-root-span-lost-inlangfuse/langfuse-python:hassieb/lfe-9178-bugsdk-python-langchaincallbackhandler-root-span-lost-inCopy head branch name to clipboard