Used cached value of project count to reduce DB load
Following !5746 (merged), backport a change from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/637/diffs#diff-2.
Does this MR meet the acceptance criteria?
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CHANGELOG entry added - Tests
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All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together