Refactor async effects

[JonasGruenwald]

Two issues:

1. Async effects for data fetching like the one used in the processes server component use the server component's subject to send a message to it(self), when they should instead just use dispatch from the effect, reference for how this should work: https://github.com/hayleigh-dot-dev/rsvp/blob/eddb81af7554200d54aea84ccd6f91d3d1446b05/src/rsvp.gleam#L403-L422
2. Most data fetching is not async yet, mainly just the OTP status stuff – this should be changed as we now allow inspecting other nodes, so data fetching may cause delays and shouldn't block server component loops