dillon1000/react

[DevTools] Preserve -Infinity in inspected values (#36347)

## Summary

`getDataType` collapsed both `Infinity` and `-Infinity` to the
`'infinity'` data type, so a `-Infinity` value coming from inspected
props/state/hooks was rehydrated on the frontend as `Infinity`.

This adds a `'-infinity'` `DataType`, routes it through
`dehydrate`/`hydrate` alongside the existing `'infinity'` arm, and makes
`smartParse`/`smartStringify` (used for editable hook values) symmetric.

## Files

- `packages/react-devtools-shared/src/utils.js` — extend `DataType`,
split sign in `getDataType`, route `'-infinity'` through
`formatDataForPreview`.
- `packages/react-devtools-shared/src/hydration.js` — `dehydrate` and
`hydrate` cases for `'-infinity'`.
- `packages/react-devtools-shared/src/devtools/utils.js` — `smartParse`
accepts `'-Infinity'`; `smartStringify` returns `'-Infinity'` for
negative infinite values.
-
`packages/react-devtools-shared/src/__tests__/inspectedElement-test.js`
and `legacy/inspectElement-test.js` — added `minus_infinity={-Infinity}`
to the simple-data-types tests + snapshots.
-
`packages/react-devtools-shell/src/app/InspectableElements/SimpleValues.js`
— added `minusInfinity` to the dev shell so the path is exercised
manually.

## Test plan

- [x] `yarn prettier` / `yarn linc`
- [x] `yarn flow dom-node` — no errors
- [x] `yarn test --silent --no-watchman -t "should support simple data
types"` (source channel)
- [x] `yarn test-www --silent --no-watchman -t "should support simple
data types"` (www-modern)
- [ ] `yarn test-build-devtools` — relies on a built bundle; left to CI
per repo policy.

Fixes #32552