Merge branch 'if-505576-remove_graphql_minimal_auth_methods_ff' into 'master'

Remove graphql_minimal_auth_methods FF

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179940



Merged-by: Andrew Evans <aevans@gitlab.com>
Approved-by: Isaac Durham <idurham@gitlab.com>
Approved-by: Andrew Evans <aevans@gitlab.com>
Co-authored-by: Imre Farkas <ifarkas@gitlab.com>