Revert "Merge branch 'replace_ftp_gnu_org_with_mirror' into 19.3

Mayra Cabrerarequested to merge
revert-af375303-19-3 into 19-3-stable

What does this MR do?

This reverts merge request !2691 (merged). To address https://gitlab.com/gitlab-com/gl-infra/production/-/work_items/22886 and unblock ongoing incidents

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