What does this MR do?
TrendingProjectsFinder so it can support caching of the data. See cb7d3989 for more details.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Trending projects is quite slow, easily taking seconds to load the entire page.
Does this MR meet the acceptance criteria?
CHANGELOG entry added
Added for this feature/bug
All builds are passing
Conform by the merge request performance guides
Conform by the style guides
Branch has no merge conflicts with
master(if you do - rebase it please)
Squashed related commits together
What are the relevant issue numbers?
https://gitlab.com/gitlab-com/infrastructure/milestones/4, in particular the section "Trending page under 2s"