Decrease the urgency of feature flag endpoint

What does this MR do and why?

This MR reflects the outcome of this discussion, that decreases the urgency of the feature flag endpoint (GET /api/:version/feature_flags/unleash/:project_id/client/features) until the maxmemory issue of redis-cache has been resolved.

Here is a guideline of decreasing urgency.

Screenshots or screen recordings

N/A

How to set up and validate locally

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MR acceptance checklist

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