revert async node flatten

[cehan-Chloe]

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

Change Type (required)

Indicate the type of change your pull request is:

• [x] patch
• [ ] minor
• [ ] major

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  Version

  Published prerelease version: 0.9.1-next.2

  Changelog

  #### 🐛 Bug Fix - revert async node flatten [#512](https://github.com/player-ui/player/pull/512) ([@cehan-Chloe](https://github.com/cehan-Chloe)) - Hermes support Android 15 [#509](https://github.com/player-ui/player/pull/509) ([@brocollie08](https://github.com/brocollie08)) - Fix js Package Releases [#507](https://github.com/player-ui/player/pull/507) ([@KetanReddy](https://github.com/KetanReddy)) - Update Custom Asset doc page with use cases on asset registering [#348](https://github.com/player-ui/player/pull/348) (nancy_wu1@intuit.com [@nancywu1](https://github.com/nancywu1)) - iOS: move HeadlessPlayerImpl from PlayerUIInternalTestUtilities to PlayerUITestUtilitiesCore [#500](https://github.com/player-ui/player/pull/500) ([@nancywu1](https://github.com/nancywu1)) #### Authors: 5 - [@brocollie08](https://github.com/brocollie08) - [@nancywu1](https://github.com/nancywu1) - Chloeeeeeee ([@cehan-Chloe](https://github.com/cehan-Chloe)) - Ketan Reddy ([@KetanReddy](https://github.com/KetanReddy)) - nancywu1 (nancy_wu1@intuit.com)

[brocollie08]

might need to change test on other platforms too

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/player-ui/player/pull/512/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=player-ui) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/player-ui/player/pull/512/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=player-ui) | `92.84% <100.00%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=player-ui#carryforward-flags-in-the-pull-request-comment) to find out more.

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