* Remove PooledClass from FallbackCompositionState

The only module that uses FallbackCompositonState is BeforeInputEventPlugin. The way its structured means there can only be a single instance of FallbackCompositionState at any given time (stored in a local variable at the top-level) so we don't really need pooling here at all. Instead, a single object is now stored in FallbackCompositionState, and access (initializing, reseting, getting data) is gaurded by the exported helper object.

* Use new FallbackCompositionState API in BeforeInputEventPlugin

* Implement event-specific pooling in SyntheticEvent

* Remove PooledClass from TopLevelCallbackBookKeeping

* Update results.json

* Add pooled event test fixtures (#1)

* Fix fixture lint

…paces (facebook#33409)

## Summary

Problem #1: Running the `link-compiler.sh` bash script via `"prebuild"`
script fails if a developer has cloned the `react` repo into a folder
that contains _any_ spaces. 3 tests fail because of this.

<img width="1003" alt="fail-1"
src="https://github.com/user-attachments/assets/1fbfa9ce-4f84-48d7-b49c-b6e967b8c7ca"
/>
<img width="1011" alt="fail-2"
src="https://github.com/user-attachments/assets/0a8c6371-a2df-4276-af98-38f4784cf0da"
/>
<img width="1027" alt="fail-3"
src="https://github.com/user-attachments/assets/1c4f4429-800c-4b44-b3da-a59ac85a16b9"
/>

For example, my current folder is:
`/Users/wes/Development/Open Source Contributions/react`

The link compiler error returns:
`./scripts/react-compiler/link-compiler.sh: line 15: cd:
/Users/wes/Development/Open: No such file or directory`

Problem #2: 1 test in `ReactChildren-test.js` fails due the existing
stack trace regex which should be lightly revised.

`([^(\[\n]+)[^\n]*/g` is more robust for stack traces: it captures the
function/class name (with dots) and does not break on spaces in file
paths.
`([\S]+)[^\n]*/g` is simpler but breaks if there are spaces and doesn't
handle dotted names well.

Additionally, we trim the whitespace off the name to resolve extra
spaces breaking this test as well:

```
-     in div (at **)
+     in div  (at **)
```

<img width="987" alt="fail-4"
src="https://github.com/user-attachments/assets/56a673bc-513f-4458-95b2-224129c77144"
/>

All of the above tests pass if I hyphenate my local folder:
`/Users/wes/Development/Open-Source-Contributions/react`

I selfishly want to keep spaces in my folder names. 🫣

## How did you test this change?

**npx yarn prebuild**

Before:
<img width="896" alt="Screenshot at Jun 01 11-42-56"
src="https://github.com/user-attachments/assets/4692775c-1e5c-4851-9bd7-e12ed5455e47"
/>

After:
<img width="420" alt="Screenshot at Jun 01 11-43-42"
src="https://github.com/user-attachments/assets/4e303c00-02b7-4540-ba19-927b2d7034fb"
/>

**npx yarn test**
**npx yarn test
./packages/react/src/\_\_tests\_\_/ReactChildren-test.js**
**npx yarn test -r=xplat --env=development --variant=true --ci
--shard=3/5**

Before:
<img width="438" alt="before"
src="https://github.com/user-attachments/assets/f5eedb22-18c3-4124-a04b-daa95c0f7652"
/>

After:
<img width="439" alt="after"
src="https://github.com/user-attachments/assets/a94218ba-7c6a-4f08-85d3-57540e9d0029"
/>

<img width="650" alt="Screenshot at Jun 02 18-03-39"
src="https://github.com/user-attachments/assets/3eae993c-a56b-46c8-ae02-d249cb053fe7"
/>

<img width="685" alt="Screenshot at Jun 03 12-53-47"
src="https://github.com/user-attachments/assets/5b2caa33-d3dc-4804-981d-52cb10b6226f"
/>