PB-8316: Making sure for failed vol delete count is initialized and updated correctly

[kgarg-px]

What type of PR is this?

Uncomment only one and also add the corresponding label in the PR: bug

What this PR does / why we need it: This PR makes sure that the failed volume count is updated correctly in the application backup We intialize the variable again, after getting the correct number, we try to update the CR then itself Does this PR change a user-facing CRD or CLI?:

Is a release note needed?:

Issue:
User Impact:
Resolution

Does this change need to be cherry-picked to a release branch?: