Admin AI settings: Migrate to use PageHeading component

Sascha Eggenbergerrequested to merge
admin-ai-features-heading-migrations into master

What does this MR do and why?

Migrates page headings to the shared PageHeading component

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before After
before after
before2 after2

How to set up and validate locally

  1. http://gdk.test:3000/admin/code_suggestions
  2. http://gdk.test:3000/admin/ai/self_hosted_models

Related to #474921 (closed)

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