[avalanche] Always print the finalization messages

Summary: Also the invalidation and stalling messages. The accepted and rejected votes (intermediate and non final steps of the vote) are still only printed when -debug=avalanche is set.

Test Plan:

ninja all check check-functional

Reviewers: #bitcoin_abc, roqqit

Reviewed By: roqqit

Differential Revision: https://reviews.bitcoinabc.org/D17068