feat: add display name and title fields to user preferences

[cc-datum]

Summary

Adds two optional fields to iam.miloapis.com/v1alpha1 UserPreference CRD:

spec.displayName: staff-facing preferred name
spec.title: staff user’s title/role

This is a foundational change for the Staff Portal My Profile / Account Preferences work so users can personalize their identity and see it reflected across the admin experience.

Details

Part of Improve Account Preference section in Staff Portal: enable profile personalization (name/title), alongside existing preferences (theme, etc.). The Portal will read/write these new fields.

Example

apiVersion: iam.miloapis.com/v1alpha1
kind: UserPreference
metadata:
  name: user-sample
spec:
  userRef:
    name: user-sample
  theme: system
  displayName: John Doe
  title: Software Engineer

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Part of datum-cloud/enhancements#364

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