[MC-124499] Missing command feedback for successfully triggering trigger

The bug

There is no command feedback anymore when you successfully trigger a trigger. This affects using /trigger without a mode and value (implicit add 1) as well as providing a mode and value.

In 1.12.2 the feedback was:

Trigger [objective_name] changed with add 1
Trigger [objective_name] changed with set 1

How to reproduce

Create a trigger scoreboard objective

/scoreboard objectives add triggerObjective trigger

Enable the trigger for you

/scoreboard players enable @p triggerObjective

Trigger the trigger
```
/trigger triggerObjective add 1
```