Advanced project search sort by stars

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Background

Currently the projects index contains stars_count but we don't use that. In order to find the most relevant projects, an order by stars would be useful to filter out forks, etc.

Proposal

Add a new sort option to ee/lib/search/elastic/sorts.rb to sort by stars_count.

Change projects search to sort by stars_count descending by default. This matches the behaviour of projects autocomplete (code)