search: rename zoektutil -> zoekt in job logic
Created by: rvantonder
Stacked on https://github.com/sourcegraph/sourcegraph/pull/34552.
No clash on zoekt
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Test plan
Semantics-preserving.
Created by: rvantonder
Stacked on https://github.com/sourcegraph/sourcegraph/pull/34552.
No clash on zoekt
access now
Semantics-preserving.