[avalanche] Remove the invalid peers before the orphans rescan

Summary:
This makes it possible to pull back proofs with utxos that conflicted with these invalid peers.

Ref T1854.

Depends on D10370.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: deadalnix

Maniphest Tasks: T1854

Differential Revision: https://reviews.bitcoinabc.org/D10383