fix: copy typed fields to additional_properties in build_from_hash

[charlie-zhang109]

Summary

• build_from_hash (the path used by the API client deserializer) set typed fields via their accessors but never mirrored them into additional_properties
• initialize() has an explicit per-field copy at the end, but build_from_hash calls new() with no args, so that copy runs against an empty attributes hash and copies nothing
• For models with x-keep-typed-in-additional-properties, this meant typed fields were invisible in additionalProperties after a real API call, even though they appeared correctly when the model was constructed directly via new(attributes)

Root cause

BaseGenericModel#build_from_hash in both v1 and v2 model_base.rb routed unknown fields to AP but had no equivalent step for typed fields:

# before — typed fields silently absent from AP after API call
if self.respond_to?(:additional_properties)
  attributes.each_with_object({}) { |(k, v), h|
    if (!self.class.attribute_map.key?(k.to_sym))
      self.additional_properties[k.to_sym] = v  # only unknown fields
    end
  }
end

Fix

After deserialization, loop over openapi_types and copy each typed field that was present in the JSON into AP, matching what initialize() already does:

if self.respond_to?(:additional_properties)
  self.class.openapi_types.each_key do |key|
    json_key = self.class.attribute_map[key]
    next unless json_key && attributes.key?(json_key)
    self.additional_properties[json_key] = self.send(key)
  end
  attributes.each_with_object({}) { |(k, v), h|
    if (!self.class.attribute_map.key?(k.to_sym))
      self.additional_properties[k.to_sym] = v
    end
  }
end

Applied to both v1/model_base.rb and v2/model_base.rb.

Test plan

• Run existing unit tests
• Run UsageSummaryResponse integration tests (bundle exec ruby usage_summary_integration_test.rb -v) — the 3 "missing from additionalProperties" failures for custom_live_ts_sum, synthetics_check_calls_count_sum, and custom_live_ts_avg are resolved

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