C# GenericHost changes to facilitate better Accept header support, DateOnly parsing, multitargetting, exposing more headers and proper JIT tokens #225

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/latest/Tags)	36s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/HelloWorld)	41s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/InlineEnumAnyOf)	40s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AllOf)	57s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOf)	35s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/SourceGeneration)	47s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOfNoCompare)	34s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/NullReferenceTypes)	43s
Build .Net projects (samples/client/petstore/csharp/restsharp/net9/EnumMappings)	39s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/OneOf)	33s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore)	36s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/Petstore)	42s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/ComposedEnum)	35s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/UseDateTimeForDate)	38s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/OneOfList)	36s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore-nonPublicApi)	32s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/FormModels)	43s
	11m 7s

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