Add missing input box for search rate limiting configuration

What does this MR do and why?

Authenticated request rate limit configuration for search is missing. I believe it somehow got lost in !80631 (2c8ddc79)

Screenshots or screen recordings

Before the change:

After the change:

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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Related to #344907