symbols: initialize instrumentation before service code
Created by: keegancsmith
In every other package (except frontend) we initialize all instrumentation before doing anything service specific. This makes symbols consistent with that. It also likely removes subtle bugs like the call to "log15.Root()" returning something different since "logging.Init()" hasn't run yet.
Test Plan: CI
Depends on https://github.com/sourcegraph/sourcegraph/pull/34329