Merge bitcoin/bitcoin#28027: test: Fixes and updates to wallet_backwards_compatibility.py for 25.0 and descriptor wallets

afd9a673c458e97305da49a70a1ddbf60e651876 test: roundtrip wallet backwards compat downgrade (Andrew Chow)
bbf43c63b9472a79462e625a1f0592973c22b47c test: Add 25.0 to wallet backwards compatibiilty test (Andrew Chow)
538939ec39e146bedffb80cf84849a450ea8fead test: Run upgrade test on all nodes (Andrew Chow)
6d4699028b17cb33953f7d11764e06069dd58915 test: Run downgrade test on descriptor wallets (Andrew Chow)
f158573be12746991b75587cc9e41a74a5e986eb test: Add 0.21 tr() incompatibility test (Andrew Chow)
f41215c3f08f99d1bfa524f2da8055b6a4458bbb test: add logging 0.17 incompatibilities in wallet back compat (Andrew Chow)
71c03aeff7e1c63c21fa72d119311230f0b30e73 test: Refactor v19 addmultisigaddress test to be distinct (Andrew Chow)
53f35d02cb7b67ddecc9514559083f85093b6ce5 test: Remove w1_v18 from wallet backwards compatibility (Andrew Chow)
313d665437079ce8426916a41a11972e97c73d6d test: Fix 0.16 wallet paths and downgrade test (Andrew Chow)
5d8469362acfb7a03e0f767dbb7166830355bead test: Add helper functions for checking node versions (Andrew Chow)

Pull request description:

  It was somewhat surprising to me that wallet_backwards_compatibility.py did not catch #27915 since the purpose of the test is to find downgrade issues such as that. It turns out the test was deficient in several places when it came to testing descriptor wallets, as well as deficient in addition to failing to correctly test some releases.

  This PR fixes these test cases, adds more informative logging, slightly refactors the entire test in order to better test future versions, and adds a 25.0 node to the test.

  Notable changes:
  * The compatibility test with 0.16 should not have been passing. The wallets were being copied incorrectly for 0.16 and resulting in 0.16 creating new wallets rather than testing the target wallets.
  * The downgrade test will actually be run on descriptor wallets and it will test that downgrades are successful, and a subsequent upgrade is also successful. This catches #27915.
  * The upgrade and downgrade test will be run on all versions up to master, rather than just 0.16, 0.17, and 0.19.

ACKs for top commit:
  Sjors:
    re-ACK afd9a673c458e97305da49a70a1ddbf60e651876
  furszy:
    ACK afd9a67

Tree-SHA512: dd2d85cab29a636da93020681c533534af4a9cda18d8550c9db9d8937719b3a225025966981c5d4d2f30486448a772b760f0e723a25ea6bc49df80387dc7b8b0

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