Raise a warning when platform-specific XAML namespace declaration has invalid URI about uno HOT 9 OPEN

The repro uses xmlns:skia="using:SkiaSharp.Views.Windows". The skia namespace is used by the XAML generator to make add platform-specific controls. Use any other name instead of skia to avoid this problem. Remaining to skia2 fixed the problem (thanks @Youssef1313 for noticing this).

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Raising a warning if the xmlns does not match the original name could be useful, indeed.

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Please also validate the behavior against WinUI implementation

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If this behavior is hot reload related, it's not fixed yet and may need to have 8.0.101 to work properly (it's still pending inhttps://github.com/unoplatform/uno.check/pull/223)

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@ramezgerges @Youssef1313 @jeromelaban I think it might make sense to detect this and warn the user:

1. Warn if any of our "default prefixes" is used with a different URI than what is defined in https://platform.uno/docs/articles/platform-specific-xaml.html#available-prefixes
2. Or warn specifically for the combination of "xmlns:skia" and "using:SkiaSharp.XYZ"

What do you think?

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@MartinZikmund That would be a duplicate of #14004 I think.

We could treat xmlns:any_platform="using:... as a CLR namespace instead of a conditional xmlns.

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Thanks for looking into this! As you say, after changing the xmlns to something else, it works now.

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@MartinZikmund should we close this in favour of #15064?

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@ramezgerges this is a bit different than the other I think - this is to validate the URI matches, so it would apply even to prefixes like "android:" etc. The other is for usage of Skia and wasm secifically on non cross runtime libraries

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