[enterprise-4.14] OADP-3179: Release Notes for OADP 1.2.4

[openshift-cherrypick-robot]

This is an automated cherry-pick of #75258

/assign adellape

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OADP-3179

In response to this:

This is an automated cherry-pick of #75258

/assign adellape

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[ocpdocs-previewbot]

🤖 Tue May 07 13:56:45 - Prow CI generated the docs preview:

https://75601--ocpdocs-pr.netlify.app/
https://75601--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/application_backup_and_restore/release-notes/oadp-release-notes-1-2.html

[openshift-ci]

@openshift-cherrypick-robot: all tests passed!

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