Make active_work match records_per_batch #4936

Job	Run time
Basic Checks	23m 28s
Additional Builds and Concurrency Tests	15m 8s
miri	3m 3s
Measure coverage	28m 46s
Release builds and tests	42m 21s
sanitize (address)	19m 48s
Slow tests	16m 3s
sanitize (address, multi-threading)	20m 41s
sanitize (leak)	8m 30s
sanitize (leak, multi-threading)	8m 57s
	3h 6m 45s

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