Merge #18451: test: shift coverage from getunconfirmedbalance to getbalances

0306d78cb49d1684cc96ba3512b582a1fdaf78cc Use getbalances in wallet_address_types tests (Jon Atack)
7eacdc5167c8db94df84e206db85817bc64e4921 Shift coverage from getunconfirmedbalance to getbalances in wallet_abandonconflict tests (Jon Atack)
3e6f7377f600e47e5e3d439fc5d6ccf3db210038 Improve getbalances coverage in wallet_balance tests (Jon Atack)

Pull request description:

  <strike>This PR updates several tests and then removes the `getunconfirmedbalance` RPC which was deprecated in facfb4111d14a3b06c46690a2cca7ca91cea8a96 a year ago.

  Next steps: remove the deprecated `getwalletinfo` fields and the `getbalance` RPC in follow-ups, if there seems to be consensus on those removals.</strike>

  Update:

  `getunconfirmedbalance` RPC was deprecated in facfb4111d14a3b06c46690a2cca7ca91cea8a96 a year ago, but following the review comments below, this PR now only updates the test coverage to use `getbalances` while still leaving basic coverage for `getunconfirmedbalance` in wallet_balance.py.

  That said, I've seen 3 regular contributors confused in the past 10 days by "DEPRECATED" warnings in the code that are not following the deprecation policy in [JSON-RPC-interface.md#versioning](https://github.com/bitcoin/bitcoin/blob/master/doc/JSON-RPC-interface.md#versioning).

  ISTM these warnings should either be removed, or the calls deprecated (`-deprecatedrpc`), or the policy updated to describe these warnings as a pre-deprecation practice.

ACKs for top commit:
  jnewbery:
    utACK 0306d78cb

Tree-SHA512: 692e43e9bed5afa97d905740666e365f0b64e559e1c75a6a398236d9e943894e3477947fc11324f420a6feaffa0c0c1532aa983c50090ca39d06551399e6ddd1

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