[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/contacts/docker-compose.yml

@@ -14,6 +14,7 @@ services:
     working_dir: /overleaf/services/contacts
     environment:
       MOCHA_GREP: ${MOCHA_GREP}
+      LOG_LEVEL: ${LOG_LEVEL:-}
       NODE_ENV: test
       NODE_OPTIONS: "--unhandled-rejections=strict"
     command: npm run --silent test:unit
@@ -31,7 +32,7 @@ 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