[Mappings editor] Regression on "scaled_float" and "date_range" type

[sebelga]

We have a regression in the "scaled_float" and "date_range" field type. Both have a logic that looks for the field type expecting a "string" but now the type is always an array of ComboBoxOption.

This regression probably came when I fixed the "serializer being called on each field value change" issue (#75166)

The issue is that both types have an extra form field to render in the form if the type is detected.

<FormDataProvider pathsToWatch="subType">
  {(formData) =>
    formData.subType === 'date_range' ? (
      <LocaleParameter defaultToggleValue={getDefaultToggleValue('locale', field.source)} />
    ) : null
  }
</FormDataProvider>

but the statement formData.subType === 'date_range' will never be true as the subType we receive is an array of objects.

I've tested both 7.9 and 7.10 and the regression is only in 7.10.

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[cjcenizal]

Fixed in #81286