USHIFT-3132: Remove the container layer workaround when building RHEL ISO

[ggiguash]

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[openshift-ci-robot]

@ggiguash: This pull request references USHIFT-3132 which is a valid jira issue.

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[pmtk]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, pmtk

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