[NativeAOT] Preserve all constructors instead of no members

[simonrozsival]

None seems to be equivalent to not having the attribute at all. The type will be stripped by ILLink and ILC. The PublicConstructors | NonPublicConstructors seems to be a better option to keep the type while making it possible to trim as much of its members as possible.

This change resolves two warnings:

ILLink : warning IL2037: <Module>..cctor(): No members were resolved for 'None' on type 'Microsoft.Maui.Controls.Handlers.Compatibility.FrameRenderer.FrameView'.
ILC : warning IL2037: <Module>..cctor(): No members were resolved for '0' on type 'Microsoft.Maui.Controls.Handlers.Compatibility.FrameRenderer.FrameView'. 

(Note: these warnings will still be present for static classes which don't have a static constructor)

@rolfbjarne I believe we don't need dotnet/runtime#90154 anymore

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• iOS (no change detected)
• tvOS (no change detected)
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• macOS (no change detected)

NET (empty diffs)

• iOS: (empty diff detected)
• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)

✅ API diff vs stable

Legacy Xamarin (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

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Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

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