[Cashtab] [p7 local msg verify] Install published dependency

Summary:
T2730

Depends on D12463

Publish xecjs-message and install this published version in Cashtab, instead of the local one we have been developing.

Snapshot tests for SignVerifyMsg are reintroduced as they are no longer broken by the locally installed dep.

Test Plan: Same as D12462

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12464