Merge #18574: cli: call getbalances.ismine.trusted instead of getwalletinfo.balance

5df0877f91f4ed59031b0d7dcd66780df87ac1af test: update and harden interface_bitcoin_cli tests (Jon Atack)
75019774c96795ef1a57af2a92dd9491f5065cc5 cli -getinfo: use getbalances instead of deprecated getwalletinfo balance (Jon Atack)

Pull request description:

  Extracted from #18453 to preserve that PR as a discussion on multiwallet RPC/CLI.

  This PR updates `bitcoin-cli -getinfo` to fetch the wallet balance from `getbalances` in order to no longer depend on `getwalletinfo.balance` which was deprecated a year ago in facfb41.

  I found this when removing the getwalletinfo() `balance`, `unconfirmed_balance`, and `immature_balance` fields to see what broke from depending on them.

  I didn't see any perceivable change in `-getinfo` run time from the change.

  Test coverage for this change is provided by `test/functional/interface_bitcoin_cli.py`, which the second commit updates to (a) no longer depend on getwalletinfo.balances and (b) test the -getinfo blockcount and balance fields against non-default, non-zero values.

ACKs for top commit:
  robot-visions:
    ACK 5df0877
  MarcoFalke:
    ACK 5df0877
  vasild:
    re-ACK 5df0877f9
  promag:
    Code review ACK 5df0877f91f4ed59031b0d7dcd66780df87ac1af.
  theStack:
    ACK https://github.com/bitcoin/bitcoin/commit/5df0877f91f4ed59031b0d7dcd66780df87ac1af

Tree-SHA512: 0dd8c62f915b1c0112e42b132dcf74a141bdd1f51e7c17d4a698b374ec296f4f9836f7058dbe237cf24f9bfb32ea5000e14f7089e2e86472d9c6a175be26e910

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