Fix noUpdateNotifier not suppressing updates

[anthonyshew]

Description

Fixes an issue where noUpdateNotifier: true in turbo.json did not suppress update notifications. The update notification logic was refactored to centralize all suppression checks (config and environment variables) in the caller, removing a redundant check that ignored the turbo.json setting.

Testing Instructions

1. Add "noUpdateNotifier": true to your turbo.json.
2. Ensure your turbo CLI version is older than the latest available.
3. Run any turbo command (e.g., turbo run build).
4. Verify that no update notification is displayed.

---

Linear Issue: TURBO-4878

 

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