Remove N+1 DB queries from indexing projects in Elasticsearch

What does this MR do?

The #as_indexed_json method is used to convert individual documents to the JSON that is sent to Elasticsearch during indexing. We need to preload the data before it gets to this method. We implemented the .preload_indexing_data method in !56808 (merged) so we just need to add this to the various classes now. This MR updates it for Project only.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

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Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
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Security

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Related to #324745 (closed)