Reduce query count for snippet search

Recudes the number of queries within the snippet search from approx. 50
to approx. 14 by preloading the authors

Part of #27392

app/views/search/results/_snippet_blob.html.haml

@@ -7,7 +7,7 @@
     = snippet.title
     by
     = link_to user_snippets_path(snippet.author) do
-      = image_tag avatar_icon(snippet.author_email), class: "avatar avatar-inline s16", alt: ''
+      = image_tag avatar_icon(snippet.author), class: "avatar avatar-inline s16", alt: ''
       = snippet.author_name
     %span.light= time_ago_with_tooltip(snippet.created_at)
   %h4.snippet-title

app/views/search/results/_snippet_title.html.haml

@@ -18,6 +18,6 @@
     %span
       by
       = link_to user_snippets_path(snippet_title.author) do
-        = image_tag avatar_icon(snippet_title.author_email), class: "avatar avatar-inline s16", alt: ''
+        = image_tag avatar_icon(snippet_title.author), class: "avatar avatar-inline s16", alt: ''
         = snippet_title.author_name
       %span.light= time_ago_with_tooltip(snippet_title.created_at)

changelogs/unreleased/snippets-search-performance.yml

@@ -0,0 +1,4 @@
+---
+title: Reduced query count for snippet search
+merge_request:
+author:

lib/gitlab/snippet_search_results.rb

@@ -31,11 +31,11 @@ module Gitlab
     private
 
     def snippet_titles
-      limit_snippets.search(query).order('updated_at DESC')
+      limit_snippets.search(query).order('updated_at DESC').includes(:author)
     end
 
     def snippet_blobs
-      limit_snippets.search_code(query).order('updated_at DESC')
+      limit_snippets.search_code(query).order('updated_at DESC').includes(:author)
     end
 
     def default_scope