[avalanche] Increase the delay for a proof to be eligible to staking rewards

Summary:
Bump from 30 minutes to 60 minutes, and set the recent registration
window to +/-30 minutes.

Depends on D15791.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15842