Enable eager-loading in development and test
What does this MR do?
This is a requirement for https://gitlab.com/gitlab-org/gitlab-ee/issues/9583.
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Security reports checked/validated by reviewer