sweep+funding: default to P2TR outputs for all change addresses and new addrs #6666
Description
Tracking a follow up from the recent PR that supports P2TR inputs in the sweeper: #6632 (comment)
In a few areas, we still use p2wkh addr by default when generating funding outputs and change addrs when sweeping. We shoudl switch to always using P2TR outputs for change addrs, as then that'll tend all a user's funds towards P2TR outputs over time just due to normal operation.
The comment thread linked above shows all the known areas that need to be modified to using P2TR everywhere for change addrs.