Feature flag docs: add performance considerations
What does this MR do and why?
Recently we have been facing a timeout issue when using and checking the feature flag inside the loop Revert '392448-npm-metadata-endpoints-high-cpu-... (!129011 - merged)
This MR adds a note for the usage of feature flags inside the loop.
Screenshots or screen recordings
No user-facing changes. Only docs changes.
How to set up and validate locally
Not required.
MR acceptance checklist
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