[avalanche] Return all the status in getrawavalancheproof RPC

Summary:
This will make debugging and testing more convenient.
The "finalized: true" case is covered in the abc_p2p_avalanche_proof_voting test, so I didn't duplicate the rpc test to keep it simple.

Depends on D11808.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Subscribers: sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D11802