Preserve Order in Maps Returned by Headless Server

Previously the order of maps from structs were not preserved in the Headless Server. This was due to a bug in the implementation of the {{MapToNestedMapsConverter }} which is now fixed. This affects all the maps retrieved from structs and the results of the MapOf* scalar types.

(CMS-21175)

Handling DataFetcherResult in DataFetchers

When the argument data of a DataFetcher (environment#getSource()) is wrapped in a DataFetcherResult, some DataFetchers did not resolve the value properly. This affected the FilteringDataFetcher, ConvertingDataFetcher and CapStructPropertyDataFetcher. The filter predicates InProductionFilterPredicate and ValidityDateFilterPredicate were not applied then, which led to unexpected visibility issues. This is fixed now.

(CMS-21071)