MM-15288: Migrate CommandStore.Get to sync by default (#10739)

* MM-15288: Migrate Command.Get to sync by default

* addressing review comments, updating status code of err returned by Get Method

store/sqlstore/command_store.go

@@ -61,16 +61,14 @@ func (s SqlCommandStore) Save(command *model.Command) (*model.Command, *model.Ap
 	return command, nil
 }
 
-func (s SqlCommandStore) Get(id string) store.StoreChannel {
-	return store.Do(func(result *store.StoreResult) {
-		var command model.Command
+func (s SqlCommandStore) Get(id string) (*model.Command, *model.AppError) {
+	var command model.Command
 
-		if err := s.GetReplica().SelectOne(&command, "SELECT * FROM Commands WHERE Id = :Id AND DeleteAt = 0", map[string]interface{}{"Id": id}); err != nil {
-			result.Err = model.NewAppError("SqlCommandStore.Get", "store.sql_command.save.get.app_error", nil, "id="+id+", err="+err.Error(), http.StatusInternalServerError)
-		}
+	if err := s.GetReplica().SelectOne(&command, "SELECT * FROM Commands WHERE Id = :Id AND DeleteAt = 0", map[string]interface{}{"Id": id}); err != nil {
+		return nil, model.NewAppError("SqlCommandStore.Get", "store.sql_command.save.get.app_error", nil, "id="+id+", err="+err.Error(), http.StatusInternalServerError)
+	}
 
-		result.Data = &command
-	})
+	return &command, nil
 }
 
 func (s SqlCommandStore) GetByTeam(teamId string) ([]*model.Command, *model.AppError) {