fix(web): report unexpected HTTP serve failures (#6210)

* fix(web): report unexpected HTTP serve failures

* test(web): cover normal close and all HTTP servers

---------

Co-authored-by: n0ctal <293235942+n0ctal@users.noreply.github.com>

internal/sub/sub.go

@@ -371,9 +371,7 @@ func (s *Server) Start() (err error) {
 		IdleTimeout:       120 * time.Second,
 	}
 
-	go func() {
-		_ = s.httpServer.Serve(listener)
-	}()
+	go network.ServeHTTP(s.httpServer, listener, "Subscription server")
 
 	return nil
 }