External inputs are currently only supported for initial transaction creation functions. Extend `solving_data` arguments as necessary to support fee bumping wallet transactions with non-wallet inputs.

https://github.com/bitcoin/bitcoin/pull/17211#issuecomment-897653994
#include <interfaces/chain.h>
#include <policy/fees.h>
#include <policy/policy.h>
#include <util/moneystr.h>
#include <util/rbf.h>
#include <util/system.h>
#include <util/translation.h>
#include <wallet/coincontrol.h>
#include <wallet/feebumper.h>
#include <wallet/fees.h>
#include <wallet/receive.h>
#include <wallet/spend.h>
#include <wallet/wallet.h>
namespace wallet {
static feebumper::Result PreconditionChecks(const CWallet& wallet, const CWalletTx& wtx, std::vector<bilingual_str>& errors) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
{
    if (wallet.HasWalletSpend(wtx.tx)) {
        errors.push_back(Untranslated("Transaction has descendants in the wallet"));