[MM-15117] Migrate "WebHook.UpdateIncoming" to Sync by default (#10637)

* SyncStore: Migrate Webhooks.UpdateIncoming method to Sync

* Changes requested by @jespino

store/storetest/mocks/WebhookStore.go

@@ -321,19 +321,28 @@ func (_m *WebhookStore) SaveOutgoing(webhook *model.OutgoingWebhook) store.Store
 }
 
 // UpdateIncoming provides a mock function with given fields: webhook
-func (_m *WebhookStore) UpdateIncoming(webhook *model.IncomingWebhook) store.StoreChannel {
+func (_m *WebhookStore) UpdateIncoming(webhook *model.IncomingWebhook) (*model.IncomingWebhook, *model.AppError) {
 	ret := _m.Called(webhook)
 
-	var r0 store.StoreChannel
-	if rf, ok := ret.Get(0).(func(*model.IncomingWebhook) store.StoreChannel); ok {
+	var r0 *model.IncomingWebhook
+	if rf, ok := ret.Get(0).(func(*model.IncomingWebhook) *model.IncomingWebhook); ok {
 		r0 = rf(webhook)
 	} else {
 		if ret.Get(0) != nil {
-			r0 = ret.Get(0).(store.StoreChannel)
+			r0 = ret.Get(0).(*model.IncomingWebhook)
 		}
 	}
 
-	return r0
+	var r1 *model.AppError
+	if rf, ok := ret.Get(1).(func(*model.IncomingWebhook) *model.AppError); ok {
+		r1 = rf(webhook)
+	} else {
+		if ret.Get(1) != nil {
+			r1 = ret.Get(1).(*model.AppError)
+		}
+	}
+
+	return r0, r1
 }
 
 // UpdateOutgoing provides a mock function with given fields: hook