[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/web/modules/server-ce-scripts/test/acceptance/src/ServerCEScriptsTests.mjs

@@ -19,6 +19,10 @@ function run(cmd) {
   // Pipe stdin from /dev/null, store stdout, pipe stderr to /dev/null.
   return execSync(cmd, {
     stdio: ['ignore', 'pipe', 'pipe'],
+    env: {
+      ...process.env,
+      LOG_LEVEL: 'warn',
+    },
   }).toString()
 }