Exception details are missing for unhandled errors

[Havunen]

The failed network request get logged to AI but exception and exception details are not shown.

Probably related to this:
https://github.com/twitchax/axum-insights/blob/main/src/lib.rs#L1098-L1106

[Havunen]

changing the macro syntax to following will fix it.

                    tracing::event!(
                        Level::ERROR,
                        ai.customEvent.name = "exception",
                        "exception.type" = format!("HTTP {}", status.as_u16()),
                        exception.message = error_message,
                        exception.stacktrace = error_stacktrace,
                        "exception"
                    );