Build 4.8: Release note images removed

From the description of https://github.com/openshift/cluster-samples-operator/pull/367, release note that the following images have been removed:

deleted imagestreamtags:
nodejs 10, 10-ubi7
perl 5.26-el7 5.26
postgresql 10-el7 10
ruby 2.5-ubi7 2.5
rhdm-decisioncentral 7.9.0
rhdm-kieserver 7.9.0
rhpam-businesscentral-monitoring 7.9.0
rhpam-businesscentral 7.9.0
rhpam-smartrouter 7.9.0

gmontero@redhat.com