Merge bitcoin/bitcoin#26201: Remove Taproot BIP 9 deployment

74f71c5054 Remove Taproot activation height (Sjors Provoost)

Pull request description:

  Drop `DEPLOYMENT_TAPROOT` from `consensus.vDeployments`.

  Now that the commit (7c08d81e11) which changes taproot to be enforced for all blocks is included in v24.0, it seems a good time to remove no longer needed non-consensus code.

  Clarify what is considered a `BuriedDeployment`.

  We drop taproot from `getdeploymentinfo` RPC, rather than mark it as `buried`, because this is not a buried deployment in the sense of [BIP 90](https://github.com/bitcoin/bips/blob/master/bip-0090.mediawiki). This is because the activation height has been completely removed from the code, unlike the hardcoded `DEPLOYMENT_SEGWIT` height which is still relied on.[^1]

  See discussion in #24737 and #26162.

  [^1]: `DEPLOYMENT_SEGWIT` is used in `IsBlockMutated` to determine if witness data is allowed, it's used for [BIP147](https://github.com/bitcoin/bips/blob/master/bip-0147.mediawiki), to trigger `NeedsRedownload()` for users who upgraded after a decade, and for a few other things.

ACKs for top commit:
  ajtowns:
    reACK 74f71c5054
  achow101:
    ACK 74f71c5054
  sedited:
    Re-ACK 74f71c5054
  darosior:
    utACK 74f71c5054

Tree-SHA512: 217e0ee2e144ccfb04cf012f45b75d08f8541287a5531bd18aa81e38bad2f38d28b772137f471c46b63875840ec044cb61a2a832e3a9e89a6183e8ab36b1b9c9

test/functional/mining_basic.py

@@ -436,6 +436,9 @@ class MiningTest(BitcoinTestFramework):
         self.log.info("getblocktemplate: segwit rule must be set")
         assert_raises_rpc_error(-8, "getblocktemplate must be called with the segwit rule set", node.getblocktemplate, {})
 
+        self.log.info("getblocktemplate: result should set the right rules")
+        assert_equal(['csv', '!segwit', 'taproot'], self.nodes[0].getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)['rules'])
+
         self.log.info("submitblock: Test block decode failure")
         assert_raises_rpc_error(-22, "Block decode failed", node.submitblock, block.serialize()[:-15].hex())
 

test/functional/rpc_blockchain.py

@@ -241,19 +241,6 @@ class BlockchainTest(BitcoinTestFramework):
                 },
                 'active': False
             },
-            'taproot': {
-                'type': 'bip9',
-                'bip9': {
-                    'start_time': -1,
-                    'timeout': 9223372036854775807,
-                    'min_activation_height': 0,
-                    'status': 'active',
-                    'status_next': 'active',
-                    'since': 0,
-                },
-                'height': 0,
-                'active': True
-            }
           }
         })