Behavior Changes:
* Those pubkeys being imported with add_keypool set and are already in the wallet will no longer be added to the keypool
This is a partial backport of Core [[https://github.com/bitcoin/bitcoin/pull/16301 | PR16301]] : https://github.com/bitcoin/bitcoin/pull/16301/commits/fae7a5befd0b8746d84a6fde575e5b4ea46cb3c4