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MINOR: [Java][Flight] Add context of descriptor on integration tests when not found

This PR adds minor logging info about the descriptor looked up when it can't be found.

For example on this ticket failure [ARROW-16441](https://issues.apache.org/jira/browse/ARROW-16441) we should be able to get more info around the descriptor:

```
panic: rpc error: code = NotFound desc = Unknown descriptor.
```

Closes #13053 from raulcd/add-descriptor-info-to-not-found

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>