Summary:
The previous fix
https://github.com/yugabyte/yugabyte-db/commit/2cc14805785879ed5635870717a72eb98a3b27ff did not mark
the universe update as succeeded, so the universe would always show up as Error after the task completed, even
if the task succeeded.

Test Plan: Run update_lb_config and verify the universe is green

Reviewers: nsingh, amalyshev

Reviewed By: amalyshev

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D38400