[Feature]: Return 'trace_id' for failed requests

[krrishdholakia]

The Feature

Return the langfuse trace id for failed requests in the error json, so it's easy for users to debug what happened -

Motivation, pitch

make it easy to debug error messages

Twitter / LinkedIn details

No response

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[ishaan-jaff]

not stale, this is useful

[ishaan-jaff]

we already have a trace_id in our standard logging payload - I suspect we need to return this in failed request headers + use the same trace_id on langfuse

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.