Summary: Scheduler implementation right now does not respect the frequency time unit and only schedules based off the frequency assuming it is set in milliseconds.

Test Plan: Create continuous backup config with interval 5 min and make sure backups are spaced appropriately

Reviewers: jmak, vkumar, #yba-api-review!

Reviewed By: jmak

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D47771