[backport#15758] test: Add reorg test to wallet_balance
[backport#15758] test: Add reorg test to wallet_balance

Summary:
https://github.com/bitcoin/bitcoin/pull/15758/commits/fa79a783d63060dc6a8521c1de58b158979a59e9

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Depends on D6442

Concludes backport of Core [[https://github.com/bitcoin/bitcoin/pull/15758 | PR15758]]

Test Plan:
  test_runner.py wallet_balance

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6443

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