Merge bitcoin/bitcoin#27944: test: various USDT functional test cleanups (27831 follow-ups)

9f55773a370a0d039e727445ccee6b84e05f562a test: refactor: usdt_mempool: store all events (stickies-v)
bc432704505eb165dd86de39ea3434c6fb7a2514 test: refactor: remove unnecessary nonlocal (stickies-v)
326db63a6819813db55ba0d01ab4fe80f7a0d818 test: log sanity check assertion failures (stickies-v)
f5525ad6808df6afc38e5c6e4767ab577e30629c test: store utxocache events (stickies-v)
f1b99ac94fb77340c4d3a5b4bbc3df28009bc773 test: refactor: deduplicate handle_utxocache_* logic (stickies-v)
ad90ba36bd930f00753643cd1fe0af72d1c828c2 test: refactor:  rename inbound to is_inbound (stickies-v)
afc0224cdbe73e326addf5fb98a3e95d941f2104 test: refactor: remove unnecessary blocks_checked counter (stickies-v)

Pull request description:

  Various cleanups to the USDT functional tests, largely (but not exclusively) follow-ups to https://github.com/bitcoin/bitcoin/pull/27831#pullrequestreview-1491438045. Except for slightly different logging behaviour in "test: store utxocache events" and "test: log sanity check assertion failures", this is a refactor PR, removing unnecessary code and (imo) making it more readable and maintainable.

  The rationale for each change is in the corresponding commit message.

  Note: except for "test: store utxocache events" (which relies on its parent, and I separated into two commits because we may want the parent but not the child), all commits are stand-alone and I'm okay with dropping one/multiple commits if they turn out to be controversial or undesired.

ACKs for top commit:
  0xB10C:
    ACK 9f55773a370a0d039e727445ccee6b84e05f562a. Reviewed the code and ran the USDT interface tests. I stepped through the commits and think all changes are reasonable.

Tree-SHA512: 6c37a0265b6c26d4f9552a056a690b8f86f7304bd33b4419febd8b17369cf6af799cb87c16df35d0c2a1b839ad31de24661d4384eafa88816c2051c522fd3bf5

0 files changed, 0 insertions, 0 deletions