[avalanche] Don't request compact proofs during IBD

Summary:
There is little chance to get valuable outcome from compact proofs during IBD, because we can't know if the staked utxos have been spent. We will be requesting them aggressively after IBD complete.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Subscribers: sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D11661