Add spec for spec/lib/gitlab/ci/status

lib/gitlab/ci/status/manual.rb

spec/lib/gitlab/ci/status/canceled_spec.rb

spec/lib/gitlab/ci/status/created_spec.rb

spec/lib/gitlab/ci/status/failed_spec.rb

spec/lib/gitlab/ci/status/manual_spec.rb

spec/lib/gitlab/ci/status/pending_spec.rb

spec/lib/gitlab/ci/status/running_spec.rb

spec/lib/gitlab/ci/status/skipped_spec.rb

spec/lib/gitlab/ci/status/success_spec.rb