Can we add `experimental_backgroundImage` style prop

[retyui]

Description

Since linear & radial gradients are implemented under experimental_backgroundImage we can add it docs about it

Jul 15, 2024 linear-gradient (0.76.x):

• facebook/react-native@b99675d
• facebook/react-native@bd0aedc

Mar 24, 2025 radial-gradient (0.80.x):

• feat: radial gradient react-native#50209

What is the problem?

Expo already updated their docs: expo/expo#38035 (comment) so new SDK will inform devs about it

But devs who uses pure React Native will never know about it, so less people can early adopt it and test it

How can we address it?

Update https://reactnative.dev/docs/view-style-props#props to add experimental_backgroundImage prop and mark it as experimental

Why is it important?

Without devs who can test it, it will stay experimental_* for long time,

Who needs this?

Existing and New learners

When should this happen (use version numbers if needed)?

linear-gradient (0.76.x):

• facebook/react-native@b99675d
• facebook/react-native@bd0aedc

radial-gradient (0.80.x):

• feat: radial gradient react-native#50209