[CLNP-6534] fix: resolve FlatList-related error on Metro 0.81.3

[OnestarLee]

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For Internal Contributors

[CLNP-6534](https://sendbird.atlassian.net/browse/CLNP-6534)

Description Of Changes

• Resolved FlatList-related error on Metro 0.81.3
• Both FlatListBidirectional and BidirectionalProps have been removed as they were unused.

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

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 11.53%. Comparing base (119150f) to head (4d8d88f).

Files with missing lines	Patch %	Lines
...e/src/components/ChatFlatList/FlatListInternal.tsx	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #231    +/-   ##
========================================
  Coverage   11.53%   11.53%            
========================================
  Files         357      357            
  Lines        8463     8460     -3     
  Branches     2386     2248   -138     
========================================
  Hits          976      976            
- Misses       7412     7483    +71     
+ Partials       75        1    -74     

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[Copilot]

Pull Request Overview

This PR fixes a FlatList-related error on Metro 0.81.3 by adjusting how the FlatList component is selected based on platform conditions. The key changes include:

• Removing unused type imports and type definitions.
• Refactoring the getFlatList function into a direct, variable-assignment approach.
• Exporting the selected FlatList component directly.

[bang9]

lgtm!