For anchor channels and neutrino backends we need to make sure
that sweeps of the same exclusive group are removed when one of
them is confirmed. Otherwise for neutrino backends those sweep
transaction are always rebroadcasted and are blocking funds in
the worst case scenario.
In LND v0.15.1, batch_open_channel used p2tr by default
for change output. However, in a later version, a breaking
change has been fixed in FundPSBT to make the change type
configurable (default to p2wkh). As batch_open_channel
uses FundPsbt, we need to put back p2tr as default for
change output
This commit also removes the first connection attempt inside
`SetupStandbyNodes` as the nodes are always connected inside each
subtest. The error returned from connection is now logged for debugging.
