Merge #21390: test: Test improvements for UTXO set hash tests

4f2653a890 test: Use deterministic chain in utxo set hash test (Fabian Jahr)
4973c5175c test: Remove wallet dependency of utxo set hash test (Fabian Jahr)
1a27af1d7b rpc: Improve gettxoutsetinfo help (Fabian Jahr)

Pull request description:

  Follow-ups to #19145:
  - Small improvement on the help text of RPC gettxoutsetinfo
  - Using deterministic blockchain in the test `functional/feature_utxo_set_hash.py`
  - Removing wallet dependency in the test `functional/feature_utxo_set_hash.py`

  Split out of #19521.

ACKs for top commit:
  MarcoFalke:
    review ACK 4f2653a890 👲

Tree-SHA512: 92927b3aa22b6324eb4fc9d346755313dec44d973aa69a0ebf80a8569b5f3a7cf3539721ebdba183737534b9e29b3e33f412515890f0d0b819878032a3bba8f9

test/functional/test_framework/wallet.py

@@ -49,6 +49,9 @@ class MiniWallet:
             self._utxos.append({'txid': cb_tx['txid'], 'vout': 0, 'value': cb_tx['vout'][0]['value']})
         return blocks
 
+    def get_address(self):
+        return self._address
+
     def get_utxo(self, *, txid=''):
         """
         Returns a utxo and marks it as spent (pops it from the internal list)