Assessment: implement privacy deletion

[JGStyle]

✨ What is the change?

This PR implements the privacy deletion feature for the self team allocation CPM

It registers the deletion handler using the sdk functinality.

Upon the deletion, the corresponding records in assignments or tutors (where applicable) related to the requesting subject is deleted.

📌 Reason for the change / Link to issue

As part of the bigger effort described in https://github.com/orgs/prompt-edu/discussions/683

🧪 How to Test

As a user with self team allocation data, request deletion:

1. click your user profile in the top right corner

2. click privacy

3. click deletion

4. request a deletion

5. approve the deletion as an admin from the privacy dashboard (Home → Privacy)
   Then, verify that the data from assessment cpm was deleted
   (f.e. by inspecting the db or the phase in the course sidebar)

🖼️ Screenshots (if UI changes are included)

no UI changes

✅ PR Checklist

• Tested locally or on the dev environment
• Code is clean, readable, and documented
• Tests added or updated (if needed)
• Screenshots attached for UI changes (if any)
• Documentation updated (if relevant)

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/gdpr-data-deletion-assessment

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