Merge branch 'ali/combine-oidc-claims-docs' into 'master'

Consolidate ID token claims documentation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/117322



Merged-by: Marcel Amirault <mamirault@gitlab.com>
Approved-by: Marcel Amirault <mamirault@gitlab.com>
Reviewed-by: Marcel Amirault <mamirault@gitlab.com>
Co-authored-by: Alishan Ladhani <aladhani@gitlab.com>