[alias-server] Remove debug logging from unit tests

Summary:
T3060

Depends on D13812

Remove debug logging statements from unit tests. These were used in fixing errors with unit tests and discovered in the 13812.

Test Plan: npm test

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D13813