Summary:
Noticed race conditions where the ybc upgrade scheduler and the ybc upgrade subtask as part of create backup, and restore operations are conflicting resulting in the force shutdown feature not working. Made a change to disable the ybc upgrade scheduler and only rely on the CreateBackup and RestoreBackup tasks for the ybc upgrade.

Made a change to use the 2.0.0.0-b9 version of ybc as we do not want to trigger new ybc upgrade tasks on the existing ybc clusters with 2.0.0.0-b9 version.

Test Plan:
  - Manually verified that the ybc upgrade scheduler is not running

Reviewers: vbansal, daniel

Reviewed By: daniel

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D29136