InitialIndexingEventWorker should process one batch at a time

Dmitry Gruzdrequested to merge
510597-zoekt-initial-indexing-should-process-one-batch into master

What does this MR do and why?

This is a corrective action from gitlab-com/gl-infra/production#19033 (closed). Instead of processing the entire table, we'd only process one batch in the scheduling service and in the event worker itself.

Query plans for batching with without_zoekt_repositories

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Related to #510597 (closed)

Edited by Dmitry Gruzd

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