sweepbatcher: threshold for immediate batch publishing #2785

Job	Run time
SQL compilation check	11s
RPC compilation check	1m 43s
build and lint code	4m 52s
verify that auto-generated documentation is up-to-date	32s
run unit-test sqlite3 race	9m 26s
run LiT itests	11m 2s
go mod check	11m 36s
run LiT unit tests	7m 21s
run unit-test postgres race	11m 1s
	57m 44s

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