[enterprise-4.19] OADP-7028: Prepare OADP 1.5 RNs for DITA

[vashirova]

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

Plus removing unsupported OADP 1.4 Release Notes files.

[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 14:19:36 - Prow CI generated the docs preview:

https://104056--ocpdocs-pr.netlify.app/ https://104056--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/application_backup_and_restore/release-notes/oadp-1-5-release-notes.html https://104056--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/application_backup_and_restore/release-notes/oadp-upgrade-notes-1-5.html https://104056--ocpdocs-pr.netlify.app/openshift-enterprise/latest/release_notes/addtl-release-notes.html

[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.

Plus removing unsupported OADP 1.4 Release Notes files.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci[bot]]

@vashirova: all tests passed!

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