search: Parenthesize query with context if it contains an operator
Created by: fkling
Turns out we already have a function that does exactly that.
appendContextFilter is used in quite a few places, which probably all
suffer from the problem of not treating OR queries properly.
I think updating the function to apply parenthesis when needed makes the
most sense, but please let me know if that's not the case.
Test plan
Unit tests
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