RFC 619: Foxtrot `IndexEnqueuer` into the auto-indexing service
Created by: efritz
Working on #35745 it became apparent we need to roll the IndexEnqueuer
into the auto indexing service, otherwise the instantiation structure in the worker will become overly complex. Doing this will make the remaining background job work much easier.
This PR is a work-in-progress to absorb the IndexEnqueuer
methods into the auto-indexing service boundary. By the time this is mergeable, we should have no more definitions of the enqueuer package, and all old callers now instantiate a service.
Test plan
Existing CI pipelines.