Remove support for legacy tar.gz pages artifacts
What does this MR do?
EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18090
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Review
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Has been reviewed by Backend
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Conform by the merge request performance guides -
Conform by the style guides
What are the relevant issue numbers?
Edited by Kamil Trzciński