[enterprise-4.21] OADP-7028: Prepare OADP 1.5 RNs for DITA

[vashirova]

Cherry Picked from commit f3301bc xref:https://github.com/openshift/openshift-docs/pull/103629

[openshift-ci-robot]

@vashirova: This pull request references OADP-7028 which is a valid jira issue.

In response to this:

Cherry Picked from commit f3301bc xref:https://github.com/openshift/openshift-docs/pull/103629

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[vashirova]

/label OADP

[ocpdocs-previewbot]

🤖 Wed Dec 17 09:58:35 - Prow CI generated the docs preview:

https://104054--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/application_backup_and_restore/release-notes/oadp-1-5-release-notes.html https://104054--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/application_backup_and_restore/release-notes/oadp-upgrade-notes-1-5.html

[openshift-ci[bot]]

@vashirova: all tests passed!

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