Add dnf and dnf-plugins-core to konflux cachi2 rpms for 4.23

[MahnoorAsghar]

This fixes this error:

+ prepare-efi.sh redhat
+ OS=redhat
+ dnf install -y dnf dnf-plugins-core

(microdnf:1646): librhsm-WARNING **: 00:26:52.683: Found 0 entitlement certificates

(microdnf:1646): librhsm-WARNING **: 00:26:52.685: Found 0 entitlement certificates
error: No package matches 'dnf'

Example build: https://art-build-history-art-build-history.apps.artc2023.pc3z.p1.openshiftapps.com/logs?nvr=ironic-container-v4.23.0-202603312349.p2.g437c88a.assembly.stream.el9&record_id=c9381db5-caa4-3ac5-c304-ea250cf61c80&group=openshift-4.23

[openshift-ci]

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[MahnoorAsghar]

/pj-rehearse ?