Enable FF "reference_cache_memoization" by default

What does this MR do and why?

Contributes to #341849 (closed)

It enables FF reference_cache_memoization by default

The feature flag was enabled globally on 2021-10-04. It showed an improvement in terms of response time and memory consumption.

Screenshots or screen recordings

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How to set up and validate locally

See instructions in !71310 (merged)

MR acceptance checklist

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