sweepbatcher: persist confirmed batches atomically #2788

Job	Run time
build and lint code	5m 6s
RPC compilation check	1m 34s
go mod check	9m 34s
SQL compilation check	7s
run unit-test sqlite3 race	9m 39s
verify that auto-generated documentation is up-to-date	32s
run unit-test postgres race	10m 58s
run LiT unit tests	7m 23s
run LiT itests	11m 34s
RPC compilation check	1m 34s
go mod check	11m 57s
verify that auto-generated documentation is up-to-date	32s
SQL compilation check	7s
build and lint code	5m 6s
run unit-test sqlite3 race	9m 39s
run LiT unit tests	7m 23s
run LiT itests	11m 34s
run unit-test postgres race	10m 58s
	1h 55m 17s

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