Merge bitcoin/bitcoin#25228: test: add BIP-125 rule 5 testcase with default mempool

687addaf136356e0f3698d6345c92d875e0a3362 test: add BIP-125 rule 5 testcase with default mempool (James O'Beirne)
6120e8e2871fecfec5ab3099c97e13951e062a4d test: allow passing sequence through create_self_transfer_multi (James O'Beirne)

Pull request description:

  Currently, we only test rule 5 of BIP-125 (replacement transactions cannot evict more than 100 transactions) by changing default mempool parameters to allow for more descendants. The current test works on a single transaction graph that has over 100 descendants.

  This patch adds a test to exercise rule 5 using the default mempool parameters. The case is a little more sophisticated: instead of working on a single transaction graph, it uses a replacement transaction to "unite" several UTXOs which join independent transaction graphs. The total number of transactions in these graphs sum to more than the max allowable replacement.

  I think the difference in transaction topology makes this a worthwhile testcase to have, setting aside the fact that this testcase works without having to use atypical mempool params.

  See also: [relevant discussion from IRC](https://www.erisian.com.au/bitcoin-core-dev/log-2022-05-27.html#l-126)

ACKs for top commit:
  laanwj:
    Code review ACK 687addaf136356e0f3698d6345c92d875e0a3362
  LarryRuane:
    ACK 687addaf136356e0f3698d6345c92d875e0a3362

Tree-SHA512: e589aeaf9d6f137d546b7809f8795d6f6043d87b15e97c2efe85b42ce8b49d977ee7d79440c542ca4b0b5ca2de527488029841a1ffc0d96c5771897df4b3f324

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