Make sure that an address imported to LND via ImportTapscript or ImportPublicKey
can be used as a delivery address in coop close.
New test cases:
- P2TR address imported with ImportTapscript
- P2TR address imported with ImportPublicKey
- P2WPKH address imported with ImportPublicKey
Safeguard against https://github.com/lightninglabs/loop/issues/923
More sub-tests are needed in "coop close with external delivery" itest, which
would break the limit for 50 blocks mined. Turning it into prefixed itest.
Also used new exclusion approach in test "remote signer" where all the prefixed
tests are excluded.
This commit removes the usage of the standby nodes and uses
`CreateSimpleNetwork` when applicable. Also introduces a helper method
`NewNodeWithCoins` to quickly start a node with funds.