MM-55733 add request context to Channelstore.Save method (#26141)

server/channels/app/platform/helper_test.go

@@ -283,7 +283,7 @@ func (th *TestHelper) CreateChannel(team *model.Team, options ...ChannelOption)
 	}
 
 	var err error
-	channel, err = th.Service.Store.Channel().Save(channel, 999)
+	channel, err = th.Service.Store.Channel().Save(th.Context, channel, 999)
 	if err != nil {
 		panic(err)
 	}