Use IANA time zone database for IANA timezone names
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area-System.DateTime
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- C#
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Description
> in .NET we support both Windows and IANA names. You shouldn't worry about naming if you are using .NET.
>
> Given that ICU is now integrated into Windows, it would be ideal for .NET to leverage the IANA time zone database directly when handling IANA names.
_Originally posted by @xtqqczze in [#53519](https://github.com/dotnet/runtime/issues/53519#issuecomment-3393586900)_
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