[net processing] Remove QueuedBlock.hash

Summary:
It's redundant with CBlockIndex::GetBlockHash()

This is a partial backport of core#22141
https://github.com/bitcoin/bitcoin/pull/22141/commits/4e90d2dd0e91e7eb560f2c1b430f13c7a047804f

Depends on D12706

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D12707