chore(*): Eliminate some more instances of `finish` (#11136)
Removing uses of `finish`, as discussed in this Zulip thread (https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/mathlib.20sat.20solvers)
This (and the previous series of PRs) eliminates the last few instances of `finish` in the main body of mathlib, leaving only instances in the `scripts`, `test`, `tactic`, and `archive` folders.
Co-authored-by: Patrick Massot <patrickmassot@free.fr>
