Revert "Add RHEL 7 for SAP ELS to the RHUI config (#1254)"

[Rezney]

This reverts commit 4ba0ec3d51126cdff31b47f96312d7c6c0d138ad.

It turned out this change is not needed at the end.

[github-actions[bot]]

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[pirat89]

as this is revert, dropping also previous note in the changelog