Fix N+1 for notes (comments) scope [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

Related to gitlab-org/search-team/team-tasks#36 (closed)

Bullet detected an N+1 call when searching Comments. Fixed by preloading associations for web searches.

Example search on GitLab.com: https://gitlab.com/search?group_id=9970&project_id=278964&repository_ref=master&scope=notes&search=update&snippets=false

#325937 (closed)

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• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
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Related to #325937 (closed)