Require `stage:` to be set with `needs:`
What does this MR do?
Since we are unsure what would be the behavior of stage:
when we work on DAG. Let's make stage: to be required
today with needs:.
Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/65568
Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/65457
Does this MR meet the acceptance criteria?
Conformity
Edited by Grzegorz Bizon