search: simplify conditional logic for running Zoekt search over repo…
Created by: rvantonder
Stacked on https://github.com/sourcegraph/sourcegraph/pull/33243.
This corrects the misnomered onlyRunSearcher
variable that we use to decide which jobs to create. I negate it and propagate it. I need this change to fix the jobMode
stuff in general.
Test plan
Semantics-preserving.