Merge #17824: wallet: Prefer full destination groups in coin selection

a2324e4d3f47f084b07a364c9a360a0bf31e86a0 test: Improve naming and logging of avoid_reuse tests (Fabian Jahr)
1abbdac6777bc5396d17a6772c8176a354730997 wallet: Prefer full destination groups in coin selection (Fabian Jahr)

Pull request description:

  Fixes #17603 (together with #17843)

  In the case of destination groups of >10 outputs existing in a wallet with `avoid_reuse` enabled, the grouping algorithm is adding left-over outputs as an "incomplete" group to the list of groups even when a full group has already been added. This leads to the strange behavior that if there are >10 outputs for a destination the transaction spending from that will effectively use `len(outputs) % 10` as inputs for that transaction.

  From the original PR and the code comment I understand the correct behavior should be the usage of 10 outputs. I opted for minimal changes in the current code although there maybe optimizations possible for cases with >20 outputs on a destination this sounds like too much of an edge case right now.

ACKs for top commit:
  jonatack:
    Re-ACK a2324e4
  achow101:
    ACK a2324e4d3f47f084b07a364c9a360a0bf31e86a0
  kallewoof:
    ACK a2324e4d3f47f084b07a364c9a360a0bf31e86a0
  meshcollider:
    Tested ACK a2324e4d3f47f084b07a364c9a360a0bf31e86a0 (verified the new test fails on master without this change)

Tree-SHA512: 4743779c5d469fcd16df5baf166024b1d3c8eaca151df1e8281b71df62b29541cf7bfee3f8ab48d83e3b34c9256e53fd38a7b146a54c79f9caa44cce3636971a

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