Disable recent search suggestions

notes

browser.urlbar.recentsearches.featureGate enables "trending suggestions" and "recent searches"
recent searches is browser.urlbar.suggest.recentsearches
meta https://bugzilla.mozilla.org/show_bug.cgi?id=1858386

I am not sure where this data is kept and how it is sanitized. It seems as if they are kept for up to 3 days (and sanitizing history does not remove them?)

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