C# GenericHost changes to facilitate better Accept header support, DateOnly parsing, multitargetting, exposing more headers and proper JIT tokens #229

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/latest/InlineEnumAnyOf)	37s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOf)	36s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore)	39s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/UseDateTimeForDate)	35s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOfNoCompare)	48s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/FormModels)	42s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/OneOfList)	57s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/Petstore)	50s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/NullReferenceTypes)	38s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/HelloWorld)	37s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/Tags)	39s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AllOf)	39s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/ComposedEnum)	39s
Build .Net projects (samples/client/petstore/csharp/restsharp/net9/EnumMappings)	37s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/OneOf)	34s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore-nonPublicApi)	34s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/SourceGeneration)	45s
	11m 26s

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