Merge bitcoin/bitcoin#23338: tests: speed up coinselector_tests

a52f1d13409e4ef46277596ec13fa8b421fa1329 walletdb: Use SQLiteDatabase for mock wallet databases (Andrew Chow)
a78c2298080f173d0266e708267458a72eb2f600 tests: Place into mapWallet in coinselector_tests (Andrew Chow)

Pull request description:

  #23288 changed coinselector_tests to use `DescriptorScriptPubKeyMan`, but it also ended up significantly slowing down the test, from 4 seconds to over 1 minute. It appears that the source of this slow down is with `CWallet::AddToWallet`, and primarily due to writing data to the mock wallet database. Because the only thing that is actually needed is for the created transaction to be placed into `CWallet::mapWallet`, this PR removes the call to `AddToWallet` and just places the transaction into `mapWallet` directly. This reduces the test time to 5 seconds.

  To speed things up further, `CreateMockWalletDatabase` is changed to make a `SQLiteDatabase` instead of a `BerkeleyDatabase`. This is safe because there are no tests that require a specific mock database type.

ACKs for top commit:
  brunoerg:
    tACK a52f1d13409e4ef46277596ec13fa8b421fa1329
  lsilva01:
    tACK a52f1d1. Performed 74.36% better on Ubuntu 20.04 (VM, 12 MB, 8vCPU).
  glozow:
    utACK a52f1d13409e4ef46277596ec13fa8b421fa1329

Tree-SHA512: da77936bfd2e816d2e71703567b9389d0ee79f3a4a690802ffe3469df5bed371b296cb822b897f625654dab9436d91fd6bc02364a518a47d746e487d70a72595

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