## Description
Adds `admin.components.header` option to allow users to insert custom
components in the page header / top of page.
[Related
discussion](https://github.com/payloadcms/payload/discussions/7584)
- [X] I have read and understand the
[CONTRIBUTING.md](https://github.com/payloadcms/payload/blob/main/CONTRIBUTING.md)
document in this repository.
## Type of change
- [ ] Chore (non-breaking change which does not add functionality)
- [X] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Change to the
[templates](https://github.com/payloadcms/payload/tree/main/templates)
directory (does not affect core functionality)
- [ ] Change to the
[examples](https://github.com/payloadcms/payload/tree/main/examples)
directory (does not affect core functionality)
- [x] This change requires a documentation update
## Checklist:
- [x] I have added tests that prove my fix is effective or that my
feature works - will add
- [X] Existing test suite passes locally with my changes
3b59416298