Merge bitcoin/bitcoin#23300: test: Implicitly sync after generate*, unless opted out

facc352648e4fe1ed9b406400b6e4a9d51f30349 test: Implicitly sync after generate*, unless opted out (MarcoFalke)

Pull request description:

  The most frequent failure in functional tests are intermittent races. Fixing such bugs is cumbersome because it involves:
  * Noticing the failure
  * Fetching and reading the log to determine the test case that failed
  * Adding a `self.sync_all()` where it was forgotten
  * Spamming out a pr and waiting for review, which is already sparse

  Also, writing a linter to catch those is not possible, nor is review effective in finding these bugs prior to merge.

  Fix all future intermittent races caused by a missing sync_block call by calling `sync_all` implicitly after each `generate*`, unless opted out. This ensures that the code is race-free (with regards to blocks) when the tests pass once, instead of our current approach where the code can never be guaranteed to be race-free.

  There are some scripted-diff cleanups (see https://github.com/bitcoin/bitcoin/pull/22567), but they will be submitted in a follow-up to reduce the conflicts in this pull.

ACKs for top commit:
  lsilva01:
    tACK facc352 on Ubuntu 20.04
  brunoerg:
    tACK facc352648e4fe1ed9b406400b6e4a9d51f30349 on MacOS 11.6

Tree-SHA512: 046a40a066b4a3bd28a3077bd654fa8887442dd1f0ec6fd11671865809ef02376f126eb667a1320ebd67b6e372c78c00dbf8bd25d86ed86f1d9a25363103ed97

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