[release-5.7] Fix openshift bundle manifest labels

[periklis]

Fix for downstream bundle builds to properly replace the labels in bundle manifests:
https://pkgs.devel.redhat.com/git/containers/loki-operator-bundle/tree/manifests/loki.grafana.com_alertingrules.yaml?h=openshift-logging-5.7-rhel-8#n7

as it used to be in 5.6 and previous builds:
https://pkgs.devel.redhat.com/git/containers/loki-operator-bundle/tree/manifests/loki.grafana.com_alertingrules.yaml?h=openshift-logging-5.6-rhel-8#n7

This issue arised from merging this upstream PR:

• operator: Provide community operator bundle grafana/loki#7308

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