util: add TransactionError includes and namespace declarations

Add TransactionError to node namespace and include it directly instead of
relying on indirect include through common/messages.h

This is a followup to a previous commit which moved the TransactionError enum.
These changes were done in a separate followup just to keep the previous commit
more minimal and easy to review.

src/qt/psbtoperationsdialog.cpp

@@ -9,6 +9,7 @@
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <node/psbt.h>
+#include <node/types.h>
 #include <policy/policy.h>
 #include <qt/bitcoinunits.h>
 #include <qt/forms/ui_psbtoperationsdialog.h>
@@ -25,6 +26,7 @@ using common::TransactionErrorString;
 using node::AnalyzePSBT;
 using node::DEFAULT_MAX_RAW_TX_FEE_RATE;
 using node::PSBTAnalysis;
+using node::TransactionError;
 
 PSBTOperationsDialog::PSBTOperationsDialog(
     QWidget* parent, WalletModel* wallet_model, ClientModel* client_model) : QDialog(parent, GUIUtil::dialog_flags),

src/qt/sendcoinsdialog.cpp

@@ -20,6 +20,7 @@
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <node/interface_ui.h>
+#include <node/types.h>
 #include <policy/fees.h>
 #include <txmempool.h>
 #include <validation.h>

src/qt/walletmodel.cpp

@@ -19,6 +19,7 @@
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <node/interface_ui.h>
+#include <node/types.h>
 #include <psbt.h>
 #include <util/translation.h>
 #include <wallet/coincontrol.h>