Merge #19610: p2p: refactor AlreadyHave(), CInv::type, INV/TX processing

fb56d37612dea6666e7da73d671311a697570dae p2p: ensure inv is GenMsgTx before ToGenTxid in inv processing (John Newbery)
aa3621385ee66c9dde5c632c0a79fba3a6ea2d62 test: use CInv::MSG_WITNESS_TX flag in p2p_segwit (Jon Atack)
24ee4f01eadb870435712950a1364cf0def06e9f p2p: make gtxid(.hash) and fAlreadyHave localvars const (Jon Atack)
b1c855453bf2634e7fd9b53c4a76a8536fc9865d p2p: use CInv block message helpers in net_processing.cpp (Jon Atack)
acd66421671e42a58e8e067868e1ab86268e3231 [net processing] Change AlreadyHaveTx() to take a GenTxid (John Newbery)
5fdfb80b861e0de3fcf8a57163b3f52af4b2df3b [net processing] Change AlreadyHaveBlock() to take block_hash argument (John Newbery)
430e183b89d00b4148f0b77a6fcacca2cd948202 [net processing] Remove mempool argument from AlreadyHaveBlock() (John Newbery)
42ca5618cae0fd9ef97d2006b17d896bc58cc17c [net processing] Split AlreadyHave() into separate block and tx functions (John Newbery)
39f1dc944554218911b0945fff7e6d06f3dab284 p2p: remove nFetchFlags from NetMsgType TX and INV processing (Jon Atack)
471714e1f024fb3b4892a7a8b34a76b83a13fa19 p2p: add CInv block message helper methods (Jon Atack)

Pull request description:

  Building on #19590 and the recent `wtxid` and `GenTxid` changes, this is a refactoring and cleanup PR to simplify and improve some of the net processing code.

  Some of the diffs are best reviewed with `-w` to ignore spacing.

  Co-authored by John Newbery.

ACKs for top commit:
  laanwj:
    Code review ACK fb56d37612dea6666e7da73d671311a697570dae
  jnewbery:
    utACK fb56d37612dea6666e7da73d671311a697570dae
  vasild:
    ACK fb56d3761

Tree-SHA512: ba39b58e6aaf850880a842fe5f6295e9f1870906ef690206acfc17140aae2ac854981e1066dbcd4238062478762fbd040ef772fdc2c50eea6869997c583e6a6d

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