[oadp-1.5] Fix OADP-6459: Adding a backupLocation to DPA with an existing backupLocation name is not rejected

[openshift-cherrypick-robot]

This is an automated cherry-pick of #1867

/assign shubham-pampattiwar

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OADP-6459

In response to this:

This is an automated cherry-pick of #1867

/assign shubham-pampattiwar

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[shubham-pampattiwar]

/retest

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