[FEAT] pass on panic/error to frontend

[k4lizen]

Describe your feature request
If the agent experiences a crash/panic etc, it would be nice to pass the stacktrace and log relating to that URL to the frontend so it could be shown to the user (if they wish, we don't want to scare non-technical users) possibly with a "open issue with stacktrace" button.

[aleksasiriski]

I would also suggest we return the log regardless of the response type (success, error, etc.), and give users the option to see it if they want so that we stay transparent in what we really log on our side.