search: inline symbol search for jobs
Created by: rvantonder
Stacked on https://github.com/sourcegraph/sourcegraph/pull/31776
So I need to do the same inlining for symbol search in order to uncork repo partitioning. A side effect of this change is that I can get rid of some todo's/redundant state and create a leaner global symbol search job.
Test plan
Semantics-preserving