New runner page: Use PageHeading component
What does this MR do and why?
Migrates the header to the shared PageHeading component for the runners page (project/group).
References
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MR acceptance checklist
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Screenshots or screen recordings
| Before | After |
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How to set up and validate locally
- Visit a project CI/CD settings
- Select “New project runner”
- Fill out the form
- See the final registration step
- Repeat for group
Related to #474922