Merge bitcoin/bitcoin#26715: Introduce `MockableDatabase` for wallet unit tests

33e2b82a4fc990253ff77655f437c7aed336bc55 wallet, bench: Remove unused database options from WalletBenchLoading (Andrew Chow)
80ace042d8fece9be50bfef1be64c6e5720e87e6 tests: Modify records directly in wallet ckey loading test (Andrew Chow)
b3bb17d5d07f51ac2e501e4a7a3bbcd17144070f tests: Update DuplicateMockDatabase for MockableDatabase (Andrew Chow)
f0eecf5e408238c64b77b0a4974ba2b9edb17487 scripted-diff: Replace CreateMockWalletDB with CreateMockableWalletDB (Andrew Chow)
075962bc25a90661612fe4613cd50ea1cae21f52 wallet, tests: Include wallet/test/util.h (Andrew Chow)
14aa4cb1e44f089a6022a2b14a98bca4a7dd9a01 wallet: Move DummyDatabase to salvage (Andrew Chow)
f67a385556c60b2e4788a378196a395fca0539f5 wallet, tests: Replace usage of dummy db with mockable db (Andrew Chow)
33c6245ac1ecdfe25b1ee4fd9e93c43393634ae3 Introduce MockableDatabase for wallet unit tests (Andrew Chow)

Pull request description:

  For the wallet's unit tests, we currently use either `DummyDatabase` or memory-only versions of either BDB or SQLite. The tests that use `DummyDatabase` just need a `WalletDatabase` so that the `CWallet` can be constructed, while the tests using the memory-only databases just need a backing data store. There is also a `FailDatabase` that is similar to `DummyDatabase` except it fails be default or can have a configured return value. Having all of these different database types can make it difficult to write tests, particularly tests that work when either BDB or SQLite is disabled.

  This PR unifies all of these different unit test database classes into a single `MockableDatabase`. Like `DummyDatabase`, most functions do nothing and just return true. Like `FailDatabase`, the return value of some functions can be configured on the fly to test various failure cases. Like the memory-only databases, records can actually be written to the `MockableDatabase` and be retrieved later, but all of this is still held in memory. Using `MockableDatabase` completely removes the need for having BDB or SQLite backed wallets in the unit tests for the tests that are not actually testing specific database behaviors.

  Because `MockableDatabase`s can be created by each unit test, we can also control what records are stored in the database. Records can be added and removed externally from the typical database modification functions. This will give us greater ability to test failure conditions, particularly those involving corrupted records.

  Possible alternative to #26644

ACKs for top commit:
  furszy:
    ACK 33e2b82
  TheCharlatan:
    ACK 33e2b82a4fc990253ff77655f437c7aed336bc55

Tree-SHA512: c2b09eff9728d063d2d4aea28a0f0e64e40b76483e75dc53f08667df23bd25834d52656cd4eafb02e552db0b9e619cfdb1b1c65b26b5436ee2c971d804768bcc

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