Pick revert of `require-all-templates-to-include-default-stages-ee'
What does this MR do?
This picks the https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10579 reverted as part of https://gitlab.com/gitlab-org/gitlab-ce/issues/60106
CE version: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27312
Resolves https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27312
Does this MR meet the acceptance criteria?
Conformity
Edited by Kamil Trzciński