Fix releases API N+1 in sorted_links usage

The preload for N+1 doesn't seem to work with the scoped
sorted_links. This adds inverse_of to sorted_links, to properly
preload Release::Link queries that check if a link is external.

Changelog: performance

app/models/release.rb

@@ -13,7 +13,7 @@ class Release < ApplicationRecord
   belongs_to :author, class_name: 'User'
 
   has_many :links, class_name: 'Releases::Link'
-  has_many :sorted_links, -> { sorted }, class_name: 'Releases::Link'
+  has_many :sorted_links, -> { sorted }, class_name: 'Releases::Link', inverse_of: :release
 
   has_many :milestone_releases
   has_many :milestones, through: :milestone_releases

changelogs/unreleased/cat-releases-sortedlinks-np1.yml

+---
+title: Fix releases API N+1 in sorted_links usage
+merge_request: 60561
+author:
+type: performance

spec/requests/api/releases_spec.rb

@@ -129,19 +129,22 @@ RSpec.describe API::Releases do
       expect(json_response.first['upcoming_release']).to eq(false)
     end
 
-    it 'avoids N+1 queries' do
+    it 'avoids N+1 queries', :use_sql_query_cache do
       create(:release, :with_evidence, project: project, tag: 'v0.1', author: maintainer)
+      create(:release_link, release: project.releases.first)
 
-      control_count = ActiveRecord::QueryRecorder.new do
+      control_count = ActiveRecord::QueryRecorder.new(skip_cached: false) do
         get api("/projects/#{project.id}/releases", maintainer)
       end.count
 
       create_list(:release, 2, :with_evidence, project: project, tag: 'v0.1', author: maintainer)
       create_list(:release, 2, project: project)
+      create_list(:release_link, 2, release: project.releases.first)
+      create_list(:release_link, 2, release: project.releases.last)
 
       expect do
         get api("/projects/#{project.id}/releases", maintainer)
-      end.not_to exceed_query_limit(control_count)
+      end.not_to exceed_all_query_limit(control_count)
     end
 
     context 'when tag does not exist in git repository' do