Remove unnecessary eagerloading

app/services/issue_links/list_service.rb

@@ -24,15 +24,13 @@ module IssueLinks
     private
 
     def issues
-      return @issues if defined?(@issues)
-
       referenced_issues = @issue.referenced_issues.select('issues.*', 'issue_links.id AS issue_links_id')
       referred_by_issues = @issue.referred_by_issues.select('issues.*', 'issue_links.id AS issue_links_id')
       authorized_issues = IssuesFinder.new(@current_user).execute
 
       union = Gitlab::SQL::Union.new([referenced_issues, referred_by_issues])
 
-      @issues = Issue.from("(#{union.to_sql}) #{Issue.table_name}")
+      Issue.from("(#{union.to_sql}) #{Issue.table_name}")
            .where(id: authorized_issues.select(:id))
            .preload(project: :namespace)
            .reorder('issue_links_id')