[Web] Fix hiding component with entering on every render

[tjzel]

Requires #5282.

Summary

Some TS shenanigans as a necessary bonus.

BEFORE	AFTER
Screen.Recording.2023-10-19.at.16.53.37.mov	Screen.Recording.2023-10-19.at.16.55.04.mov

Test plan

import { StyleSheet, View, Button } from 'react-native';

import Animated, { FadeIn } from 'react-native-reanimated';

import React from 'react';

export default function EmptyExample() {
  const [shouldBeUseEntering, setShouldBeUseEntering] = React.useState(false);

  function handlePress() {
    setShouldBeUseEntering(!shouldBeUseEntering);
  }

  return (
    <View style={styles.container}>
      <Button title="ShouldBeUseEntering" onPress={handlePress} />
      <Animated.View
        style={styles.box}
        entering={shouldBeUseEntering ? FadeIn : undefined}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  box: {
    width: 100,
    height: 100,
    backgroundColor: 'blue',
  },
});

[m-bert]

Thanks for fixing! There's only one thing that I'd like you to explain and we're good to go.

[m-bert]

Now it looks fine 🟢