feat(React19): Add support for React19

[rebeccaalpert]

• Upgraded dependencies for test runner because it was no longer working - version 2 is deprecated

• Added React19 support

• Removed generated files from git and added to .gitignore

• Checked with 19 and it builds but gets docs error as expected

• 18 builds and works

• 17 builds but there are some React errors

WARNING in ../../node_modules/@patternfly/react-core/dist/esm/components/Card/CardHeader.js 15:21-32
export 'useId' (imported as 'React') was not found in 'react' (possible exports: Children, Component, Fragment, Profiler, PureComponent, StrictMode, Suspense, __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED, cloneElement, createContext, createElement, createFactory, createRef, forwardRef, isValidElement, lazy, memo, useCallback, useContext, useDebugValue, useEffect, useImperativeHandle, useLayoutEffect, useMemo, useReducer, useRef, useState, version)
WARNING in ../../node_modules/@patternfly/react-core/dist/esm/components/DataList/DataListCheck.js 8:21-32
export 'useId' (imported as 'React') was not found in 'react' (possible exports: Children, Component, Fragment, Profiler, PureComponent, StrictMode, Suspense, __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED, cloneElement, createContext, createElement, createFactory, createRef, forwardRef, isValidElement, lazy, memo, useCallback, useContext, useDebugValue, useEffect, useImperativeHandle, useLayoutEffect, useMemo, useReducer, useRef, useState, version)

I checked against main branch and it has similar errors there. useId was introduced in React 18, so that's probably been broken for a while. Unsure if we want to open a follow-up issue or shrug since no one has complained about React 17 support being broken.

[kmcfaul]

I'm fine with leaving the v17 warnings until its requested, since this extension is deprecated and this would have been an old bug.

[github-actions]

🎉 This PR is included in version 6.1.0-prerelease.1 🎉

The release is available on:

• GitHub release
• npm package (@prerelease dist-tag)

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