[misc] silence logger when running tests (#22243)

* [misc] silence logger when running tests

* [misc] re-enable logging in some tests for scripts

* [misc] make it easy to turn on verbose logging for tests

```
LOG_LEVEL=debug make test_unit
LOG_LEVEL=debug make test_acceptance
```
GitOrigin-RevId: 219bc6d1f9cbdb89ddd7d94742920913ddde4514

services/document-updater/docker-compose.yml

@@ -14,6 +14,7 @@ services:
     working_dir: /overleaf/services/document-updater
     environment:
       MOCHA_GREP: ${MOCHA_GREP}
+      LOG_LEVEL: ${LOG_LEVEL:-}
       NODE_ENV: test
       NODE_OPTIONS: "--unhandled-rejections=strict"
     command: npm run --silent test:unit
@@ -34,7 +35,7 @@ services:
       MONGO_HOST: mongo
       POSTGRES_HOST: postgres
       MOCHA_GREP: ${MOCHA_GREP}
-      LOG_LEVEL: ERROR
+      LOG_LEVEL: ${LOG_LEVEL:-}
       NODE_ENV: test
       NODE_OPTIONS: "--unhandled-rejections=strict"
     user: node

services/document-updater/test/acceptance/js/helpers/DocUpdaterApp.js

@@ -9,7 +9,6 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const app = require('../../../../app')
-require('@overleaf/logger').logger.level('fatal')
 
 module.exports = {
   running: false,