[avalanche] Integrate the IBD check into the quorum check

Summary:
Because the proofs can't be relied upon until we are synced, considering the quorum valid before the end of IBD is a non sense. This will also prevent the node from voting when not synced (added test).

Depends on D11618.

Test Plan:

ninja check-all

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D11619