Call `complete` listeners exclusively when the actor reaches its done status

[Andarist]

related to https://github.com/statelyai/xstate/discussions/4608

this removes the ability to listen for "on stop" but complete was already not called in different scenarios for stopped snapshots:

• like in subscribe here
• or like when starting an actor with a rehydrated stopped snapshot here

So this is currently inconsistent, one way or another, and we should unify it. When it comes to the "on stop" listener - personally, I just don't see a lot of use cases for it. A different modeling approach is always possible and I'd prefer to steer people towards explicit modeling and away from adding implicit ad-hoc logic in listeners like this.

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[davidkpiano]

For "on stop", which is still an important "event" to listen for, we can just listen for the snapshot status === 'stopped', right?

[Andarist]

For "on stop", which is still an important "event" to listen for

Why? 😉 Whenever I think about it, I always conclude that I wouldn't ever want to listen to it. subscribe is currently mainly used to notify people about a meaningful change in the underlying data and I think that, more often than not, people wouldn't consider a stopped snapshot something that they need to account for. The stopped snapshot is important for us internally but users should rarely interact with it in their code.

I think it's important to back up the claim of its importance with some real-life use cases oriented on app development and their needs.