Drop the entity-aware variation of a custom event

I'm in great favour of this, the only issue is that the triggering actions can forward an entity token that has different names, but it's always known as entity in the receiving entity aware custom event. We can only resolve this when we also add support for token mapping in custom event triggers, as described here ✨ Make custom events re-usable for rendering and other event types Active .

Adding more related issues to this one. It feels like they're all so closely related that we should most likely implement them altogether.

vinodhini.e → made their first commit to this issue’s fork.