[enterprise-4.16] CNV-51253: Clean up for DITA migration before updating docs

[abrennan89]

Manual cherrypick of 16ccbda xref: #98269

[openshift-ci-robot]

@abrennan89: This pull request references CNV-51253 which is a valid jira issue.

In response to this:

Manual cherrypick of 16ccbda xref: #98269

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[ocpdocs-previewbot]

🤖 Wed Sep 03 15:03:39 - Prow CI generated the docs preview:

https://98452--ocpdocs-pr.netlify.app/
https://98452--ocpdocs-pr.netlify.app/openshift-enterprise/latest/virt/backup_restore/virt-disaster-recovery.html

[openshift-ci]

@abrennan89: all tests passed!

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