Document how to enable eager loading in specs via `GITLAB_TEST_EAGER_LOAD`
The following discussion from !72964 (merged) should be addressed:
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@splattael started a discussion: (+2 comments) Suggestion (non-blocking) We've never documented the variable
GITLAB_TEST_EAGER_LOAD
so I was wondering if we should add a small section to https://docs.gitlab.com/ee/development/testing_guide/best_practices.html#rspec just in case folks want rely on eager loading?🤔
Edited by Peter Leitzen