Merge branch 'ld-graphql-feature_category-api-for-base-classes' into 'master'

Add feature category `api` to GraphQL Base object specs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/130261



Merged-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Co-authored-by: Luke Duncalfe <lduncalfe@eml.cc>