Draft: Test N+1 fix

What does this MR do and why?

Describe in detail what your merge request does and why.

This is a temporary MR to test possible fixes to the N+1 issue being seen in a community contribution.

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app/models/ci/pipeline.rb

@@ -466,8 +466,8 @@ def self.latest_pipeline_per_commit(commits, ref = nil)
       sql.index_by(&:sha)
     end
 
-    def self.latest_ids_per_project
-      group(:project_id).select('max(id) as id')
+    def self.latest_per_project
+      select("DISTINCT ON (project_id) id, project_id, status").order(:project_id, id: :desc)
     end
 
     def self.last_finished_for_ref_id(ci_ref_id)