large number of additional manifests exceeds ignition area

This was discovered during Contrail testing when a large number of additional manifests specific to contrail were added to the openshift/ dir. The additional manifests are here - https://github.com/Juniper/contrail-networking/tree/main/releases/23.1/ocp.

When creating the agent image the following error occurred:
failed to fetch Agent Installer ISO: failed to generate asset \"Agent Installer ISO\": failed to create overwrite reader for ignition: content length (802204) exceeds embed area size (262144)"]

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