Merge branch 'lm-add-ci-config-0' into 'master'

app/graphql/resolvers/ci/config_resolver.rb

app/graphql/types/ci/config/config_type.rb

app/graphql/types/ci/config/group_type.rb

app/graphql/types/ci/config/job_type.rb

app/graphql/types/ci/config/need_type.rb

app/graphql/types/ci/config/stage_type.rb

app/graphql/types/ci/config/status_enum.rb

app/graphql/types/query_type.rb

changelogs/unreleased/lm-add-ci-config-0.yml

doc/api/graphql/reference/gitlab_schema.graphql

doc/api/graphql/reference/gitlab_schema.json

doc/api/graphql/reference/index.md

spec/graphql/resolvers/ci/config_resolver_spec.rb

spec/graphql/types/ci/config/config_type_spec.rb

spec/graphql/types/ci/config/group_type_spec.rb

spec/graphql/types/ci/config/job_type_spec.rb

spec/graphql/types/ci/config/need_type_spec.rb

spec/graphql/types/ci/config/stage_type_spec.rb

spec/requests/api/graphql/ci/config_spec.rb

spec/support/gitlab_stubs/gitlab_ci_includes.yml