fix: detect swiftui images not too agressively

[marandaneto]

💡 Motivation and Context

If you do:

ZStack {
            Color.white
                .edgesIgnoringSafeArea(.all)
            
            ScrollView {
                VStack(spacing: 50) {
                    ForEach((1...40).reversed(), id: \.self) {
                        Text("\($0)")
                            .frame(maxWidth: .infinity)
                            .frame(height: 40)
                    }
                }
            }
        }

the whole screenshot will be masked because Color is of the type _UIGraphicsView, if you have masking enabled.
here we special case this type so its never masked but other things that are inherited from _UIGraphicsView should still be masked.

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.