Migrate Channel.AnalyticsTypeCount to Sync by default (#11097)

* Migrate Channel.AnalyticsTypeCount to Sync by default

* Fixing tests

app/import_test.go

@@ -92,8 +92,7 @@ func AssertAllPostsCount(t *testing.T, a *App, initialCount int64, change int64,
 }
 
 func AssertChannelCount(t *testing.T, a *App, channelType string, expectedCount int64) {
-	if r := <-a.Srv.Store.Channel().AnalyticsTypeCount("", channelType); r.Err == nil {
-		count := r.Data.(int64)
+	if count, err := a.Srv.Store.Channel().AnalyticsTypeCount("", channelType); err == nil {
 		if count != expectedCount {
 			debug.PrintStack()
 			t.Fatalf("Channel count of type: %v. Expected: %v, Got: %v", channelType, expectedCount, count)