Angular testing passes but logs thousands of lines of errors

[garethbowen]

Describe the issue

Running npm run unit -- --watch=false in the webapp dir logs thousands of lines of errors like the one below which makes it hard to see failing tests.

 ERROR: 'NG0304: 'mm-messages-more-menu' is not a known element (used in the 'MessagesComponent' component template):
1. If 'mm-messages-more-menu' is an Angular component, then verify that it is a part of an @NgModule where this component is declared.
2. If 'mm-messages-more-menu' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.'

Example build: https://github.com/medic/cht-core/actions/runs/6210774070/job/16859344259#step:10:3827

Describe the improvement you'd like

Fix the test setup to resolve these errors.

[garethbowen]

Merged.