[Skia] ImageBrush_Formats is not reliable

[MartinZikmund]

Current behavior

This sample page currently has various issues:

• Many exceptions are thrown on initial load
• heic format does not load
• pdf format does not load
• svg format does not load and many warnings are continuously logged in the output window
• TextBlock with ImageBrush as Foreground is not displayed (likely unsupported, but no fallback)

Expected behavior

No response

How to reproduce it (as minimally and precisely as possible)

No response

Workaround

No response

Works on UWP/WinUI

None

Environment

No response

NuGet package version(s)

No response

Affected platforms

No response

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

No response

[ramezgerges]

TextBlocks with ImageBrush foregrounds log a NotSupported expection that states clearly that some other brushes are supported, but not ImageBrush. heic is not supported due to the lack of codecs that get compiled into Skia. Not sure about pdf but it feels extremely niche anyway. I didn't get any exceptions (other than the NotSupported exception mentioned earlier).