Revert "Merge branch '227114_populate_resolved_on_default_branch_column_for_existing_vulnerabilities' into 'master'"

What does this MR do?

This reverts !38795 (merged) (and !40397 (merged) which was fixing a failing pipeline introduced by it) as it's causing issues on canary: gitlab-com/gl-infra/production#2576 (closed).