feat(backup): switch interval input to minutes across all flows #34

Job	Run time
backup-restore (sqlite, multipart)	9s
backup-restore (sqlite, single)	10s
backup-restore (timescaledb, single)	29s
backup-restore (mariadb, multipart)	25s
backup-restore (timescaledb, multipart)	28s
backup-restore (postgresql, single)	22s
backup-restore (mysql, multipart)	34s
backup-restore (mariadb, single)	25s
backup-restore (mysql, single)	31s
backup-restore (postgresql, multipart)	24s
	3m 57s

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