Merge bitcoin/bitcoin#30592: Remove mempoolfullrbf

c189eec848 doc: release note for mempoolrullrbf removal (Greg Sanders)
d47297c6aa rpc: Mark fullrbf and bip125-replaceable as deprecated (Greg Sanders)
04a5dcee8a docs: remove requirement to signal bip125 (Greg Sanders)
111a23d9b3 Remove -mempoolfullrbf option (Greg Sanders)

Pull request description:

  Given https://github.com/bitcoin/bitcoin/pull/30493 and the related discussion on network uptake it's probably not helpful to have an option for a feature that will not be respected by the network in any meaningful way.

  Wallet changes can be done in another PR on its own cadence to account for possible fingerprinting, waiting for fullrbf logic to permeate the network, etc.

ACKs for top commit:
  stickies-v:
    re-ACK c189eec848
  achow101:
    ACK c189eec848
  murchandamus:
    ACK c189eec848
  rkrux:
    reACK c189eec848

Tree-SHA512: 9447f88f8f291c56c5bde70af0a91b0a4f5163aaaf173370fbfdaa3c3fd0b44120b14d3a1977f7ee10e27ffe9453f8a70dd38aad0ffb8c39cf145049d2550730

src/init.cpp

@@ -637,7 +637,6 @@ void SetupServerArgs(ArgsManager& argsman, bool can_listen_ipc)
                              "is of this size or less (default: %u)",
                              MAX_OP_RETURN_RELAY),
                    ArgsManager::ALLOW_ANY, OptionsCategory::NODE_RELAY);
-    argsman.AddArg("-mempoolfullrbf", strprintf("(DEPRECATED) Accept transaction replace-by-fee without requiring replaceability signaling (default: %u)", DEFAULT_MEMPOOL_FULL_RBF), ArgsManager::ALLOW_ANY, OptionsCategory::NODE_RELAY);
     argsman.AddArg("-permitbaremultisig", strprintf("Relay transactions creating non-P2SH multisig outputs (default: %u)", DEFAULT_PERMIT_BAREMULTISIG), ArgsManager::ALLOW_ANY,
                    OptionsCategory::NODE_RELAY);
     argsman.AddArg("-minrelaytxfee=<amt>", strprintf("Fees (in %s/kvB) smaller than this are considered zero fee for relaying, mining and transaction creation (default: %s)",