Can we remove `maybe_propose_quiescence` now?

[TheBlueMatt]

This was added to test quiescence pre-splicing, but presumably it can be dropped now? Also we should fuzz splicing.

[wpaulino]

Yeah we can drop it, though I do like being able to test it in isolation without relying on protocol features that depend on it.

[TheBlueMatt]

Yea fair, it's just an awkward test given quiescence depends heavily on whatever protocol it ultimately initiates.