Do not call the `prepare_links` methods in core REST API controllers, unless the `_links` or `_embedded` fields are requested. There is no need to prepare links if they are never returned in the response. This saves resources, as many calls to `prepare_links` methods perform database queries.
Props Spacedmonkey, timothyblynjacobs, rachelbaker, desrosj, dlh, hellofromTonya.
Fixes#52992.
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