fix(metricbeat): log messages before out channel is closed (#47659)

The wrapper signals completion to the caller via the output channel
but a log message is currently emitted after the channel has been closed.
We should move all log statements to occur before closing the channel,
ensuring no messages are logged post-closure.

Co-authored-by: Tiago Queiroz <tiago.queiroz@elastic.co>

Author: kruskall

metricbeat/mb/module/wrapper.go

@@ -180,8 +180,8 @@ func (mw *Wrapper) Start(done <-chan struct{}) <-chan beat.Event {
 	// Close the output channel when all writers to the channel have stopped.
 	go func() {
 		wg.Wait()
-		close(out)
 		mw.logger.Named("module").Debugf("Stopped %s", mw)
+		close(out)
 	}()
 
 	return out