wallet: Always set descriptor cache upgraded flag for new wallets #32597

1. 
   achow101 commented at 0:39 am on May 23, 2025: member

   Newly created wallets will always have an upgraded descriptor cache, so set those.

   Also, to verify this behavior, add a new flags field to getwalletinfo and check that in the functional tests.

   Split from #32489

2. wallet: Set upgraded descriptor cache flag for newly created wallets

   Although WalletBatch::LoadWallet performs the descriptor cache upgrade,
   because new wallets do not have the descriptor flag set yet, the upgrade
   does not run and set the flag.
   
   Since new wallets will always being using the upgraded cache, there's no
   reason to wait to set the flag, so set it when the wallet flags are
   being initialized for new wallets.

   69f588a99a
3. wallet: Add GetWalletFlags bc2a26b296
4. wallet, rpc: Output wallet flags in getwalletinfo 47237cd193
5. 
   DrahtBot commented at 0:39 am on May 23, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32597.

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6. DrahtBot added the label Wallet on May 23, 2025

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Wallet