Summary: Make sure 100% is returned for successful tasks. We still want to record subtasks which were not run. So, they are left intact.

Test Plan: Manually modified task_info to test. Also aborted and retried tasks for the freeze part.

Reviewers: cwang, vkumar, anijhawan

Reviewed By: vkumar, anijhawan

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D39670