Merge bitcoin/bitcoin#24711: wallet: Postpone wallet loading notification for encrypted wallets

0c12f0116c wallet: Postpone NotifyWalletLoaded() for encrypted wallets (Hennadii Stepanov)
aeee419c6a wallet, refactor: Add wallet::NotifyWalletLoaded() function (Hennadii Stepanov)

Pull request description:

  Fixes bitcoin-core/gui#571.

  `CWallet::Create()` notifies about wallet loading too early, that results the notification goes before `DescriptorScriptPubKeyMan`s were created and added to an encrypted wallet.

  And `interfaces::Wallet::taprootEnabled()` in https://github.com/bitcoin/bitcoin/blob/ecf692b466860f44334a1da967fc2559da913bec/src/qt/receivecoinsdialog.cpp#L100-L102 erroneously returns `false` for just created encrypted descriptor wallets.

ACKs for top commit:
  Sjors:
    utACK 0c12f0116c
  achow101:
    ACK 0c12f0116c

Tree-SHA512: 2694bacd12748cd5f6c95d9d3bf8bcf4502ee67fecd8d057f33236b72069c61401b08f49deb013fc71c3f1e51ae16bdfd827ddcbc2a083d7044589be7a78982e

src/wallet/test/wallet_tests.cpp

@@ -54,6 +54,7 @@ static const std::shared_ptr<CWallet> TestLoadWallet(WalletContext& context)
     std::vector<bilingual_str> warnings;
     auto database = MakeWalletDatabase("", options, status, error);
     auto wallet = CWallet::Create(context, "", std::move(database), options.create_flags, error, warnings);
+    NotifyWalletLoaded(context, wallet);
     if (context.chain) {
         wallet->postInitProcess();
     }