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Document `let_it_be` usage on test subject

Shinya Maeda requested to merge doc-let-it-be-on-subject into master

What does this MR do?

Document how let_it_be should be used for testing subject. Given that we're heavily relying on the let_it_be for speeding up test, in some cases, we use let_it_be for testing subject as well. This documentation clarifies the best practice on let_it_be on test subject, and potential drawback.

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Edited by Shinya Maeda

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