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

facc352648 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 facc352648 on MacOS 11.6

Tree-SHA512: 046a40a066b4a3bd28a3077bd654fa8887442dd1f0ec6fd11671865809ef02376f126eb667a1320ebd67b6e372c78c00dbf8bd25d86ed86f1d9a25363103ed97

test/functional/rpc_fundrawtransaction.py

@@ -1097,7 +1097,7 @@ class RawTransactionsTest(BitcoinTestFramework):
         # than any single input available, and require more than 1 input. So we make 3 outputs
         for i in range(0, 3):
             funds.sendtoaddress(tester.getnewaddress(address_type="bech32"), 1)
-        self.generate(self.nodes[0], 1)
+        self.generate(self.nodes[0], 1, sync_fun=self.no_op)
 
         # Create transactions in order to calculate fees for the target bounds that can trigger this bug
         change_tx = tester.fundrawtransaction(tester.createrawtransaction([], [{funds.getnewaddress(): 1.5}]))