bug: Prebuilds are being displayed as tasks

**Screenshot:**

<img width="1388" height="637" alt="Image" src="https://github.com/user-attachments/assets/1e3547b5-99b7-47ba-ae16-04818fc04489" />

**Expected behavior:** 

- Prebuild workspaces should not be displayed as tasks. 

**Possible solutions:**

- Filter prebuild workspaces in the BE

