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Celery runner: only schedule tasks when the buffer is less than 80% full

Nicolas Dandrimont requested to merge generated-differential-D3164-source into generated-differential-D3164-target

The queries to pick up tasks from the scheduler sometimes degenerate when the number of tasks fetched is too low, which hangs the runner for all other tasks. Adding this lower bound helps postgresql use proper optimizations to pull tasks.

Test Plan

this has been running in production for a while.

Migrated from D3164 (view on Phabricator)

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