Fix blobs search N+1 [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 blobs (Code Search). Fixed by preloading associations for web searches. In this case we're actually preloading project associations.

The yield_each_search_result is responsible for preloading projects and we pass with_web_entity_associations there.

#326318 (closed)

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Related to #326318 (closed)