app/vminsert: correctly stop StopIngestionRateLimiter before vminsert.Stop in vmsingle shutdown

vmsingle shuts down vminsert before closing the ingestion rate limiter, even though the rate limiter API explicitly requires the opposite order to unblock callers. vminsert.Stop() waits for unmarshal workers, which can be blocked in ingestionRateLimiter.Register() when the limit is hit.

app/victoria-metrics/main.go

@@ -118,8 +118,8 @@ func main() {
 		logger.Fatalf("cannot stop the webservice: %s", err)
 	}
 	logger.Infof("successfully shut down the webservice in %.3f seconds", time.Since(startTime).Seconds())
-	vminsert.Stop()
 	vminsertcommon.StopIngestionRateLimiter()
+	vminsert.Stop()
 
 	vmstorage.Stop()
 	vmselect.Stop()