Merge branch 'am-update-feature-category-for-features-admin' into 'master'

Add feature_category to spec/features/admin/

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/104698



Merged-by: Alper Akgun <aakgun@gitlab.com>
Approved-by: Tarun Vellishetty <tvellishetty@gitlab.com>
Approved-by: Alper Akgun <aakgun@gitlab.com>
Co-authored-by: Alina Mihaila <amihaila@gitlab.com>