React Native sync for revisions c9f6d0a...6d3ecb7

Summary:
This sync includes the following changes:
- **[6d3ecb70d](facebook/react@6d3ecb70d )**: Remove unstable_changedBits ([#20953](facebook/react#20953)) //<Andrew Clark>//
- **[754e30728](facebook/react@754e30728 )**: Delete immediateQueueCallbackNode ([#20980](facebook/react#20980)) //<Andrew Clark>//
- **[be5a2e231](facebook/react@be5a2e231 )**: Land enableSyncMicrotasks ([#20979](facebook/react#20979)) //<Andrew Clark>//
- **[f6bc9c824](facebook/react@f6bc9c824 )**: [Fizz] Expose maxBoundarySize as an option ([#21029](facebook/react#21029)) //<Sebastian Markbåge>//
- **[154b85213](facebook/react@154b85213 )**: [Fizz] Expose a method to explicitly start writing to a Node stream ([#21028](facebook/react#21028)) //<Sebastian Markbåge>//
- **[cf485e6f6](facebook/react@cf485e6f6 )**: [Fizz] Expose a method to abort a pending request ([#21027](facebook/react#21027)) //<Sebastian Markbåge>//
- **[3fb11eed9](facebook/react@3fb11eed9 )**: React Native: Touch Instrumentation Interface ([#21024](facebook/react#21024)) //<Timothy Yung>//
- **[825c3021f](facebook/react@825c3021f )**: Don't delete trailing mismatches during hydration at the root ([#21021](facebook/react#21021)) //<Sebastian Markbåge>//
- **[1d1e49cfa](facebook/react@1d1e49cfa )**: [Fizz] Assign an ID to the first DOM element in a fallback or insert a dummy (and testing infra) ([#21020](facebook/react#21020)) //<Sebastian Markbåge>//
- **[466b26c92](facebook/react@466b26c92 )**: Store commit durations on HostRoot for DevTools access ([#20983](facebook/react#20983)) //<Brian Vaughn>//
- **[89acfa639](facebook/react@89acfa639 )**: Fix native event batching in concurrent mode ([#21010](facebook/react#21010)) //<Ricky>//
- **[0203b6567](facebook/react@0203b6567 )**: chore: update react-reconciler README ([#21016](facebook/react#21016)) //<susiwen8>//

Changelog:
[General][Changed] - React Native sync for revisions c9f6d0a...6d3ecb7

jest_e2e[run_all_tests]

Reviewed By: JoshuaGross, kacieb

Differential Revision: D27231625

fbshipit-source-id: 89c0c0662e69044ae8890486a693013bee6005dd

Libraries/Renderer/REVISION

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