[bisq-network/bisq] Added graceful shutdown hook (#4047)

[wiz]

## Expected Result

Last line of log output should be
```
Mar-18 02:28:35.012 [JavaFX Application Thread] INFO  bisq.core.app.BisqExecutable: Graceful shutdown completed. Exiting now. 
```

## Actual Result

Last line of log output is random

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