ci: better context of changes for AI review (#1468)

## 📜 Description

Supply original file + diff. Not final file + diff for AI review, as it
may confuse AI reviews.

## 💡 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. -->

I realized that if we supply final file + changes then LLM may be
confused by that fact and produce "reversed" output:
https://github.com/kirillzyusko/react-native-keyboard-controller/pull/1450#issuecomment-4369163942

So in this PR I'll supply original content, let's see how it'll work 👀 

## 📢 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 -->

### CI

- supply original file for AI review (not a new version).

## 🤔 How Has This Been Tested?

Will be tested later 🤞 

## 📝 Checklist

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