[oadp-1.4] OADP-4379: read ephemeral-storage in code

[mateusoliveira43]

Why the changes were made

cherry picked from commit https://github.com/openshift/oadp-operator/commit/b51ce21d3df79005a81ed6e579a3359cffa46b0f : PR https://github.com/openshift/oadp-operator/pull/1477

How to test the changes made

Follow instructions from parent PR.

[openshift-ci-robot]

@mateusoliveira43: This pull request references OADP-4379 which is a valid jira issue.

In response to [this](https://github.com/openshift/oadp-operator/pull/1491): >## Why the changes were made > >cherry picked from commit https://github.com/openshift/oadp-operator/commit/b51ce21d3df79005a81ed6e579a3359cffa46b0f : PR https://github.com/openshift/oadp-operator/pull/1477 > >## How to test the changes made > >Follow instructions from parent PR. > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Foadp-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[mateusoliveira43]

/retest

[mateusoliveira43]

/retest infra and post restore flake

[mateusoliveira43]

/retest

[mateusoliveira43]

/retest

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mateusoliveira43, shubham-pampattiwar

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/oadp-operator/blob/oadp-1.4/OWNERS)~~ [shubham-pampattiwar] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[weshayutin]

/retest

[weshayutin]

hrm... this doesn't seem like a "flake" more like build / containers aren't right, but unrelated to this patch.

[mateusoliveira43]

/retest

[mateusoliveira43]

/retest

[mateusoliveira43]

/retest

[mateusoliveira43]

/retest

[openshift-ci[bot]]

@mateusoliveira43: all tests passed!

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).

[shubham-pampattiwar]

/lgtm