Fix rendering Blazor elements inside SVG

[captainsafia]

To address most of the failures outlined in https://github.com/dotnet/aspnetcore/blob/main/src/Components/test/E2ETest/Tests/SvgTest.cs, we need to make sure that the SVG rendering supports scenarios like:

• Render fragments inside an SVG
• Render components inside an SVG
• Event handling with an SVG

I'm bucketing these under the general category of "rendering Blazor inside SVG" since the changes to fix this will likely fall in the browser renderer.

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