Merge #15931: Remove GetDepthInMainChain dependency on locked chain interface

36b68de5b2938722911db900ca299f7008780d01 Remove getBlockDepth method from Chain::interface (Antoine Riard)
b66c429c56c85fa16c309be0b2bca9c25fdd3e1a Remove locked_chain from GetDepthInMainChain and its callers (Antoine Riard)
0ff03871add000f8b4d8f82aeb168eed2fc9dc5f Use CWallet::m_last_block_processed_height in GetDepthInMainChain (Antoine Riard)
f77b1de16feee097a88e99d2ecdd4d84beb4f915 Only return early from BlockUntilSyncedToCurrentChain if current tip is exact match (Antoine Riard)
769ff05e48fb53d4b62c59060424a0fea71d0aab Refactor some importprunedfunds checks with guard clause (Antoine Riard)
5971d3848e09abf571e5308185275296127efca4 Add block_height field in struct Confirmation (Antoine Riard)
9700fcb47feca9d78e005b8d18b41148c8f6b25f Replace CWalletTx::SetConf by Confirmation initialization list (Antoine Riard)
5aacc3eff15b9b5bdc951f1e274f00d581f63bce Add m_last_block_processed_height field in CWallet (Antoine Riard)
10b4729e33f76092bd8cfa06d1a5e0a066436f76 Pass block height in Chain::BlockConnected/Chain::BlockDisconnected (Antoine Riard)

Pull request description:

  Work starter to remove Chain::Lock interface by adding m_last_block_processed_height in CWallet and m_block_height in CMerkleTx to avoid GetDepthInMainChain having to keep a lock . Once this one done, it should ease work to wipe out more cs_main locks from wallet code.

  I think it's ready for a first round of review before to get further.

  - `BlockUntilSyncedToCurrent` : restrain isPotentialTip to isTip because we want to be sure that wallet see BlockDisconnected callbacks if its height differs from the Chain one. It means during a reorg, an RPC could return before the BlockDisconnected callback had been triggered. This could cause a tx that had been included in the disconnected block to be displayed as confirmed, for example.

  ~~- `AbandonTransaction` : in case of conflicted tx (nIndex = -1), we set its m_block_height to the one of conflicting blocks, but if this height is superior to CWallet::m_last_block_processed_height, that means tx isn't conflicted anymore so we return 0 as tx is again unconfirmed~~ After #16624, we instead rely on Confirmation.

  ~~- `AddToWalletIfInvolvingMe`: in case of block disconnected, transactions are added to mempool again, so we need to replace old txn in `mapWallet` with a height set to zero so we remove check on block_hash.IsNull~~ Already done in #16624

ACKs for top commit:
  jnewbery:
    @jkczyz you've ACKed an intermediate commit (github annoyingly orders commits in date order, not commit order). Did you mean to ACK the final commit in this branch (36b68de5b2938722911db900ca299f7008780d01).
  jkczyz:
    > @jkczyz you've ACKed an intermediate commit (github annoyingly orders commits in date order, not commit order). Did you mean to ACK the final commit in this branch ([36b68de](https://github.com/bitcoin/bitcoin/commit/36b68de5b2938722911db900ca299f7008780d01)).
  meshcollider:
    utACK 36b68de5b2938722911db900ca299f7008780d01
  ryanofsky:
    Code review ACK 36b68de5b2938722911db900ca299f7008780d01. Changes since last review: new jkczyz refactor importprunedfunds commit, changed BlockUntilSyncedToCurrentChainChanges commit title and description, changed Confirmation struct field order and line-wrapped comment
  jnewbery:
    utACK 36b68de5b2938722911db900ca299f7008780d01
  promag:
    Code review ACK 36b68de5b2938722911db900ca299f7008780d01.

Tree-SHA512: 08b89a0bcc39f67c82a6cb6aee195e6a11697770c788ba737b90986b4893f44e90d1ab9ef87239ea3766508b7e24ea882b7199df41173ab27a3d000328c14644

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