Improve handling of INVALID in IsMine

Summary:

• Do not expose invalidity from IsMine
• Add additional unit tests for invalid IsMine combinations
• Add P2WSH destination helper and use it instead of manual hashing

This is a backport of Core PR13491

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Differential Revision: https://reviews.bitcoinabc.org/D6381