fix: don't mask SwiftUI gradient views

[ioannisj]

💡 Motivation and Context

ticket: https://posthoghelp.zendesk.com/agent/tickets/22163

Avoid masking SwiftUI gradient views (e.g LinearGradient, RadialGradient, or AngularGradient)

💚 How did you test it?

locally

📝 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.