refactor: Use psbt forward declaration

Also clean up forward other forward declarations in interfaces/wallet.h with !sort

Original motivation for this change was to fix a circular dependencies lint
error: "interfaces/chain.h -> interfaces/wallet.h -> psbt -> node/transaction
-> node/context -> interfaces/chain.h" from an earlier commit in this PR adding
a "interfaces/chain.h -> interfaces/wallet.h" include. Now, the wallet include
is no longer added, but it is still good to clean up the psbt include for
efficiency, and to sort the forward declarations.

src/qt/walletmodel.cpp

@@ -20,6 +20,7 @@
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <key_io.h>
+#include <psbt.h>
 #include <ui_interface.h>
 #include <util/system.h> // for GetBoolArg
 #include <wallet/coincontrol.h>