Ava Chow 4375d74d24 Merge bitcoin/bitcoin#34993: wallet: NotifyCanGetAddressesChanged when advancing next_index
e2ab8ae551 wallet: spkm: Only notify CanGetAddressesChanged on change (David Gumberg)
0892f16f91 refactor: moveonly: Pair CanGetAddressesChanged notifications with desc range. (David Gumberg)
e6adae3db2 wallet: `NotifyCanGetAddressesChanged` when advancing `next_index` (David Gumberg)

Pull request description:

  Even though `TopUp()` notifies, advancing `next_index` after can deplete available addresses, so make sure to notify any time it's changed.

  This would manifest as users seeing a clickable `Receive` button in the GUI when in fact no address can be generated in some edge cases, e.g. when a user has a watch only wallet with a hardened derivation path and runs out of keys.

  This feels like it's begging for:

  1) a refactor to make it impossible to modify `next_index` or `range_end` without firing `CanGetAddressesChanged`
  2) a test

  I banged my head against the keyboard for a bit but I couldn't get either of these to fall out, I also tried massaging a few clankers into doing it but I couldn't get any results that seemed reasonable to me, still seems like a worthwhile fix so opening PR anyway.

  I also included a moveonly commit to pair code that can change the result of `CanGetAddresses()` with the notification firing

ACKs for top commit:
  achow101:
    ACK e2ab8ae551
  polespinasa:
    ACK e2ab8ae551
  furszy:
    utACK e2ab8ae551

Tree-SHA512: 5bb00d1ef4909a3e55535d283e5995df75e4288a151647f4a368b2086e2f2f4140693f43cae4f72727eafb49c9050aea8604cd6ddddc8646f7ac47b1357ed287
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Bitcoin Core integration/staging tree

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