Fix local react usage in DOM fixture

[jackpope]

The DOM fixture hasn't worked on local builds since the UMD support was removed in #28735

Here we update the fixture to set the local experimental builds to window. Some of the pages are still broken, such as hydration. But these bugs exist on other versions as well and can be cleaned up separately.

[react-sizebot]

Comparing: 87276ef...6dc099e

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	514.24 kB	514.24 kB	=	91.73 kB	91.74 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	556.18 kB	556.18 kB	=	98.72 kB	98.72 kB
facebook-www/ReactDOM-prod.classic.js	=	595.79 kB	595.79 kB	=	104.85 kB	104.85 kB
facebook-www/ReactDOM-prod.modern.js	=	586.21 kB	586.21 kB	=	103.30 kB	103.30 kB
facebook-react-native/react-dom/cjs/ReactDOM-dev.js	=	17.57 kB	17.15 kB	=	3.90 kB	3.78 kB
facebook-react-native/react-dom/cjs/ReactDOMTestUtils-dev.js	=	1.80 kB	1.39 kB	=	0.84 kB	0.71 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
facebook-www/ReactReconcilerConstants-dev.classic.js	+1.10%	0.63 kB	0.64 kB	+1.45%	0.35 kB	0.35 kB
facebook-www/ReactReconcilerConstants-dev.modern.js	+1.10%	0.63 kB	0.64 kB	+1.45%	0.35 kB	0.35 kB
facebook-react-native/react/cjs/React-dev.js	=	66.67 kB	66.17 kB	=	14.68 kB	14.56 kB
facebook-react-native/react/cjs/JSXRuntime-dev.js	=	26.77 kB	26.39 kB	=	6.31 kB	6.22 kB
facebook-react-native/react/cjs/JSXDEVRuntime-dev.js	=	26.51 kB	26.13 kB	=	6.29 kB	6.20 kB
facebook-react-native/react-dom/cjs/ReactDOM-dev.js	=	17.57 kB	17.15 kB	=	3.90 kB	3.78 kB
facebook-react-native/react-dom/cjs/ReactDOMTestUtils-dev.js	=	1.80 kB	1.39 kB	=	0.84 kB	0.71 kB

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