fix: reanimated bundle mode compatibility for `KeyboardChatScrollView` (#1556)

## 📜 Description

Fixed an issue that is caused by deep workletization when using
`KeyboardChatScrollView`.

## 💡 Motivation and Context

<!-- Why is this change required? What problem does it solve? -->
<!-- If it fixes an open issue, please link to the issue here. -->

Same fix that we did in
https://github.com/kirillzyusko/react-native-keyboard-controller/issues/395
(but now only targeting `KeyboardChatScrollView`).

Ideally would be to cover such things with custom eslint plugin, but I
don't have resources for creating one, so just replicating fix again
🤷‍♂️

Closes
https://github.com/kirillzyusko/react-native-keyboard-controller/issues/1555

## 📢 Changelog

<!-- High level overview of important changes -->
<!-- For example: fixed status bar manipulation; added new types
declarations; -->
<!-- If your changes don't affect one of platform/language below - then
remove this platform/language -->

### JS

- avoid using `Platfrom.OS` directly in worklet because such
construction tries to bundle whole react-native into worklet;

## 🤔 How Has This Been Tested?

Tested via CI.

## 📸 Screenshots (if appropriate):

<!-- Add screenshots/video if needed -->
<!-- That would be highly appreciated if you can add how it looked
before and after your changes -->

## 📝 Checklist

- [x] CI successfully passed
- [x] I added new mocks and corresponding unit-tests if library API was
changed