This is a clone of issue OCPBUGS-56596. The following is the description of the original issue:
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When using the agent-based installer, setting the additionalTrustBundlePolicy field is not taking effect. The reason for this is that assisted-service does not import the InstallConfig struct from the installer, but instead has its own independent copy in which this field is missing. Therefore the install-config-overrides cannot be applied.

This should be validated at the time the install-config-overrides are applied (and the code appears to do so), but for unknown reasons the overrides are being silently ignored.

A side-effect of this is that any other install-config-overrides are also silently ignored when the additionalTrustBundlePolicy is set to a non-default value. This can be observed e.g. by setting fips: true at the same time - the resulting cluster will not have FIPS enabled.

We need to both fix the validation (since users could manually edit the install-config-overrides annotation to add invalid fields) and populate additionalTrustBundlePolicy in assisted-service's copy of the InstallConfig type.