[avalanche] remove proof details from getavalanchepeerinfo RPC

Summary:
Now that there is a decodeavalancheproof RPC to inspect details for a given proof, it is enough to return the complete proof. This makes for a more compact and readable result.

Depends on D9526

Test Plan:

src/bitcoin-cli help getavalanchepeerinfo
src/bitcoin-cli getavalanchepeerinfo

test/functional/test_runner.py abc_rpc_ava* abc_p2p_ava*

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Differential Revision: https://reviews.bitcoinabc.org/D9527