While some protocols require value attached to OP_RETURN outputs, this otherwise seems like a mistake.

Setting the value to 0 should really be done by the wallet/script creating the transaction (like createrawtransaction does for `data` outputs). However, as an additional check, similar to the high-fee check, sendrawtransaction could also check for non-zero value OP_RETURN outputs.

This should be configurable by a new RPC argument.

See also https://transactionfee.info/charts/output-opreturn-amount/

#### Useful skills:

* Bitcoin Core RPC code
* Transaction output types
* Bitcoin Core functional tests

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+ HelpExampleCli("signrawtransactionwithwallet", "\"myhex\"") +
            "\nSend the transaction (signed hex)\n"
            + HelpExampleCli("sendrawtransaction", "\"signedhex\"") +
            "\nAs a JSON-RPC call\n"
            + HelpExampleRpc("sendrawtransaction", "\"signedhex\"")
                },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
        {
            CMutableTransaction mtx;
            if (!DecodeHexTx(mtx, request.params[0].get_str())) {
                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed. Make sure the tx has at least one input.");
            }
            CTransactionRef tx(MakeTransactionRef(std::move(mtx)));
            const CFeeRate max_raw_tx_fee_rate = request.params[1].isNull() ?
                                                     DEFAULT_MAX_RAW_TX_FEE_RATE :
                                                     CFeeRate(AmountFromValue(request.params[1]));
            int64_t virtual_size = GetVirtualTransactionSize(*tx);
            CAmount max_raw_tx_fee = max_raw_tx_fee_rate.GetFee(virtual_size);
            std::string err_string;
            AssertLockNotHeld(cs_main);
            NodeContext& node = EnsureAnyNodeContext(request.context);
            const TransactionError err = BroadcastTransaction(node, tx, err_string, max_raw_tx_fee, true, true);
            if (TransactionError::OK != err) {
                throw JSONRPCTransactionError(err, err_string);
            }
            return tx->GetHash().GetHex();
        },
    };
}
static RPCHelpMan testmempoolaccept()