revert async node flatten

[cehan-Chloe]

1. Revert flatten nested node change
2. update tests for all platforms

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Version

Published prerelease version: 0.9.1-next.2

Changelog

🐛 Bug Fix

• revert async node flatten #512 (@cehan-Chloe)
• Hermes support Android 15 #509 (@brocollie08)
• Fix js Package Releases #507 (@KetanReddy)
• Update Custom Asset doc page with use cases on asset registering #348 (nancy_wu1@intuit.com @nancywu1)
• iOS: move HeadlessPlayerImpl from PlayerUIInternalTestUtilities to PlayerUITestUtilitiesCore #500 (@nancywu1)

Authors: 5

• @brocollie08
• @nancywu1
• Chloeeeeeee (@cehan-Chloe)
• Ketan Reddy (@KetanReddy)
• nancywu1 (nancy_wu1@intuit.com)

[brocollie08]

might need to change test on other platforms too

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.84%. Comparing base (12b4867) to head (870606d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #512      +/-   ##
==========================================
+ Coverage   91.88%   92.84%   +0.95%     
==========================================
  Files         341      341              
  Lines       27237    27232       -5     
  Branches     1945     1944       -1     
==========================================
+ Hits        25028    25284     +256     
+ Misses       2195     1948     -247     
+ Partials       14        0      -14     

Flag	Coverage Δ
	92.84% <100.00%> (?)

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