[proofpoint_on_demand] Adapt definitions of nested subfields #11031
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Same change as #11016 that I forgot to apply to this package.
Adapt definitions of subfields of nested objects so they are actually installed by Fleet. New mappings are otherwise equivalent.
These mappings were correctly defined as expected by the spec, but Fleet was only installing empty nested objects. To workaround that, subfields can be moved to have their own definitions.
Issue in Fleet is fixed in elastic/kibana#191730, but we can apply this workaround for older versions of the stack.