(jest/setup): Add missing methods to Image mock

[AntoineDoubovetzky]

Summary:

Fixes #35518

Changelog:

Test Plan:

I used the example provided in the issue:

import { useEffect } from "react"
import { Image } from "react-native"
import { render } from '@testing-library/react-native';

const MyComponent = () => {
    useEffect(() => {
        Image.getSize('uri', (width, height) => {
            console.log({width, height})
        })
    }, [])

    return null
}

describe('Foo', () => {
    it('something', () => {
        render(<MyComponent/>)
    })
})

Before the fix:

And after the fix:

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[facebook-github-bot]

@rshest merged this pull request in 4da2013.