fix N+1 queries in kb_overview_rows
#6441
Merged
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mozilla/sumo#2114
Review and merge #6438 prior to this PR, and then rebase this PR once that's done.
Notes
ready_for_l10n
#6438, makes the number of DB queries within thekb_overview_rows()
function O(1) instead of O(N) where N is the number of English documents, so the combination of the two PR's should massively improve the performance of https://support.mozilla.org/en-US/contributors/kb-overview.