Split assets build to dedicated job (partially reverted)

Chad Woolleyrequested to merge
split-assets-into-separate-job into master

NOTE: This MR was reverted and re-done in !57794 (merged), because it had problems with the custom config monkey patch

The PDF deletions were not reverted, however:

Remove PDF handling and unused empty sitemap file.

  • Delete unused PDFs
  • Understand why GitLab_Enterprise_Edition_2-Pager.pdf doesn't show up in the current assets build sitemap.
    • It appears to be because it is referred to by a link_to tag from /source/includes/gitlab-ee/10-contact-sales.html.haml, which makes it handled by the /source/includes/gitlab-ee/10-contact-sales.html.haml page.
Edited by Chad Woolley

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