[bisq-network/bisq] closing/cancellation of suspended transactions with the consensus of the two parties to the transaction without the participation of the curator/moderator of the transaction (#3516)

[C# _]

### Description

more manual handling is required

#### Version

Bisq x64 1.1.7 + 1.2.0

### Steps to reproduce

1. I sent a small amount of bitcoins from the _Electrum client to Bisq_.
When sending coins, a **1sat/byte transfer fee** was initially specified.
2. A transaction appears in the blockchain, but without confirmations.
In Bisq, I immediately see them on the balance and can open trades with traders on these coins.
3. Without waiting for confirmation of this transaction I open a trade with the trader on these coins
Now, in relation to this transaction, a **new transaction appears in the blockchain that does not have a confirmed parent** (_the very first transfer with a 1sat/byte commission_).
I do it regularly. Was doing before this incident and after this incident. Always everything went correctly. But there is one feature specifically in this transaction.

- The parent has a low сommission, so the transaction does not find confirmations for a long time (about 40 minutes waited). 
- To speed up the procedure I decided to increase the Commission of the initial (still not confirmed) transaction to 10 sat/byte (Electrum has such a function).

That's probably what caused the problem. The deal is displayed in the current open and what to do with it I do not understand.

Opened a dispute in Bisq. Through what the time debate was closed and all without changes. The deal is hanging open.

There is an error message in the transaction itself:
```
An error occurred at task: SignMediatedPayoutTx
Exception message: trade.getDepositTx() must not be null
```
### Expected behaviour

Participants in the transaction must be able to cancel transactions by mutual consent. In General, bitcoins returned somehow to Bisq, but the transaction for this operation expects a transfer from me apparently.

### Actual behaviour

The trade is displayed in the list of active trades.

#### Device or machine

Win7 x64 (actual updates)


#### P.S.

The moderator of the transaction has the right to close or cancel such "slow" transactions? What is the protocol for such situations?


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