[Fabric] Addditonal PlatformColor types not implemented

[Saadnajmi]

In Paper (the legacy renderer) we implemented the conversion for PlatformColor / DynamicColorMacOS / ColorWithSystemEffectMacOS in `RCTConvert.mm:

react-native-macos/packages/react-native/React/Base/RCTConvert.mm

Line 1105 in 721a5aa

+ (RCTUIColor *)UIColor:(id)json // [macOS]

This is missing from the Fabric Color conversion code ( https://github.com/microsoft/react-native-macos/blob/721a5aa852add0a8dc0beb09b86c47d369268199/packages/react-native/ReactCommon/react/renderer/graphics/platform/ios/react/renderer/graphics/HostPlatformColor.mm ).