[CLNP-7537] revert: improve keyboard avoidance behavior for Android API 35+

[OnestarLee]

External Contributions

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If you have a pull request that you believe should be accepted, please contact
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For Internal Contributors

[CLNP-7537](https://sendbird.atlassian.net/browse/CLNP-7537)

Description Of Changes

Android API 35+ 에서 edge-to-dege 대응으로 추가했던 로직이 RN 버전에따라 높이 값이 안맞는 문제가 발견 되었습니다.
ReactNative에서 관련 이슈가 등록된 상태라 언젠가 수정이 될거로 예상되고
추후 호환성을 위해 일단 코드 롤백하고, 릴리즈 노트와 고객에게 MainActivity.kt를 수정하도록 가이드할 예정입니다

Types Of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply_

• Bugfix
• New feature
• Documentation (correction or otherwise)
• Cosmetics (whitespace, appearance (ex) Prettier)
• Build configuration
• Improvement (refactor code)
• Test

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 11.22%. Comparing base (b53e439) to head (9b27ce9).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...react-native/src/components/ChannelInput/index.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
+ Coverage   11.20%   11.22%   +0.02%     
==========================================
  Files         360      360              
  Lines        8732     8716      -16     
  Branches     2486     2460      -26     
==========================================
  Hits          978      978              
- Misses       7678     7737      +59     
+ Partials       76        1      -75     

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[Copilot]

Pull Request Overview

This PR reverts keyboard avoidance behavior improvements that were specifically added for Android API 35+ due to compatibility issues with different React Native versions. The changes remove edge-to-edge layout handling logic and revert to the previous keyboard avoidance implementation.

• Removes Android API 35+ specific keyboard avoidance logic including conditional padding behavior
• Eliminates keyboard visibility tracking state and related event listeners
• Simplifies keyboard vertical offset calculation back to the original implementation

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[bang9]

edge-to-edge 가 문제가 많군요..