feat(backup): switch interval input to minutes across all flows #33

Job	Run time
backup-restore (mysql, single)	33s
backup-restore (mariadb, single)	22s
backup-restore (sqlite, multipart)	14s
backup-restore (sqlite, single)	13s
backup-restore (mariadb, multipart)	24s
backup-restore (timescaledb, single)	29s
backup-restore (timescaledb, multipart)	30s
backup-restore (postgresql, single)	22s
backup-restore (postgresql, multipart)	19s
backup-restore (mysql, multipart)	37s
	4m 3s

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