Add generate_ci_finished_builds_sync_events for more flexibility

What does this MR do and why?

This MR adds the generate_ci_finished_builds_sync_events FF for more flexibility disabling the input queue separately from the processing of the queue.

Rollout issue: #424866 (closed)

EE: true

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

N/A

MR acceptance checklist

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