Merge bitcoin/bitcoin#22818: test: Activate all regtest softforks at height 1, unless overridden

fa4db8671b test: Activate all regtest softforks at height 1, unless overridden (MarcoFalke)
faad1e5ffd Introduce -testactivationheight=name@height setting (MarcoFalke)
fadb2ef2fa test: Add extra_args argument to TestChain100Setup constructor (MarcoFalke)
faa46986aa test: Remove version argument from build_next_block in p2p_segwit test (MarcoFalke)
fa086ef539 test: Remove unused ~TestChain100Setup (MarcoFalke)

Pull request description:

  All softforks that are active at the tip of mainnet, should also be active from genesis in regtest. Otherwise their rules might not be enforced in user testing, thus making their testing less useful.

  To still allow tests to check pre-softfork rules, a runtime argument can change the activation height.

ACKs for top commit:
  laanwj:
    Code review ACK fa4db8671b
  theStack:
    re-ACK fa4db8671b

Tree-SHA512: 6397d46ff56ebc48c007a4cda633904d6ac085bc76b4ecf83097c546c7eec93ac0c44b88083b2611b9091c8d1fb8ee1e314065de078ef15e922c015de7ade8bf

src/test/util/setup_common.cpp

@@ -205,7 +205,8 @@ TestingSetup::TestingSetup(const std::string& chainName, const std::vector<const
     }
 }
 
-TestChain100Setup::TestChain100Setup()
+TestChain100Setup::TestChain100Setup(const std::vector<const char*>& extra_args)
+    : TestingSetup{CBaseChainParams::REGTEST, extra_args}
 {
     SetMockTime(1598887952);
     constexpr std::array<unsigned char, 32> vchKey = {
@@ -321,11 +322,6 @@ CMutableTransaction TestChain100Setup::CreateValidMempoolTransaction(CTransactio
     return mempool_txn;
 }
 
-TestChain100Setup::~TestChain100Setup()
-{
-    gArgs.ForceSetArg("-segwitheight", "0");
-}
-
 CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CMutableTransaction& tx) const
 {
     return FromTx(MakeTransactionRef(tx));