GH-10617 SyncStore: GetIncomingByChannel to sync (#10633)

* GH-10617 GetIncomingByChannel to sync

* GH-10617 using async calls explicitly

* GH-10617 order of assignment change

* Update store.go

* Update store.go

* Update store.go

* GH-10617 fmt fix

app/channel.go

@@ -766,8 +766,13 @@ func (a *App) UpdateChannelMemberNotifyProps(data map[string]string, channelId s
 }
 
 func (a *App) DeleteChannel(channel *model.Channel, userId string) *model.AppError {
-	ihc := a.Srv.Store.Webhook().GetIncomingByChannel(channel.Id)
+	ihc := make(chan store.StoreResult, 1)
 	ohc := a.Srv.Store.Webhook().GetOutgoingByChannel(channel.Id, -1, -1)
+	go func() {
+		webhooks, err := a.Srv.Store.Webhook().GetIncomingByChannel(channel.Id)
+		ihc <- store.StoreResult{Data: webhooks, Err: err}
+		close(ihc)
+	}()
 
 	var user *model.User
 	if userId != "" {