[rn] enabled disableLegacyMode everywhere

[rickhanlonii]

Stacked on #34946

This should be a noop, now that the legacy renderers are not being sync'd.

[react-sizebot]

Comparing: 90817f8...e819cfb

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	=	605.41 kB	605.41 kB	=	107.22 kB	107.22 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	=	664.38 kB	664.38 kB	=	117.09 kB	117.09 kB
facebook-www/ReactDOM-prod.classic.js	=	688.25 kB	688.25 kB	=	121.13 kB	121.13 kB
facebook-www/ReactDOM-prod.modern.js	=	678.67 kB	678.67 kB	=	119.48 kB	119.49 kB
facebook-react-native/react-dom/cjs/ReactDOM-prod.js	+3.10%	6.48 kB	6.68 kB	+1.16%	1.81 kB	1.83 kB
facebook-react-native/react-dom/cjs/ReactDOM-profiling.js	+3.10%	6.48 kB	6.68 kB	+1.16%	1.81 kB	1.83 kB
facebook-react-native/react-dom/cjs/ReactDOM-dev.js	+2.75%	16.74 kB	17.20 kB	+3.72%	3.60 kB	3.74 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
facebook-react-native/react-dom/cjs/ReactDOM-prod.js	+3.10%	6.48 kB	6.68 kB	+1.16%	1.81 kB	1.83 kB
facebook-react-native/react-dom/cjs/ReactDOM-profiling.js	+3.10%	6.48 kB	6.68 kB	+1.16%	1.81 kB	1.83 kB
facebook-react-native/react-dom/cjs/ReactDOM-dev.js	+2.75%	16.74 kB	17.20 kB	+3.72%	3.60 kB	3.74 kB
facebook-react-native/react/cjs/React-dev.js	=	52.61 kB	52.09 kB	=	11.61 kB	11.54 kB
facebook-react-native/react-dom/cjs/ReactDOMProfiling-profiling.js	=	675.63 kB	668.01 kB	=	115.86 kB	114.54 kB
facebook-react-native/react-dom/cjs/ReactDOMProfiling-prod.js	=	597.95 kB	591.04 kB	=	105.45 kB	104.30 kB
facebook-react-native/react-dom/cjs/ReactDOMProfiling-dev.js	=	1,165.77 kB	1,152.18 kB	=	192.32 kB	190.51 kB
facebook-react-native/react-dom/cjs/ReactDOMClient-profiling.js	=	669.70 kB	661.81 kB	=	114.70 kB	113.38 kB
facebook-react-native/react-dom/cjs/ReactDOMClient-prod.js	=	592.45 kB	585.28 kB	=	104.39 kB	103.23 kB
facebook-react-native/react-dom/cjs/ReactDOMClient-dev.js	=	1,149.50 kB	1,135.33 kB	=	189.53 kB	187.59 kB
react-native/implementations/ReactFabric-profiling.fb.js	=	463.00 kB	455.77 kB	=	77.32 kB	76.14 kB
react-native/implementations/ReactFabric-dev.fb.js	=	773.17 kB	760.76 kB	=	122.48 kB	120.69 kB
react-native/implementations/ReactFabric-dev.js	=	769.76 kB	757.28 kB	=	123.00 kB	121.16 kB
react-native/implementations/ReactFabric-prod.fb.js	=	387.71 kB	381.15 kB	=	67.24 kB	66.11 kB
react-native/implementations/ReactFabric-profiling.js	=	458.93 kB	450.55 kB	=	77.17 kB	75.95 kB
facebook-react-native/react-test-renderer/cjs/ReactTestRenderer-prod.js	=	344.56 kB	337.97 kB	=	59.93 kB	58.76 kB
facebook-react-native/react-test-renderer/cjs/ReactTestRenderer-profiling.js	=	369.36 kB	362.19 kB	=	63.29 kB	62.13 kB
react-native/implementations/ReactFabric-prod.js	=	383.99 kB	376.39 kB	=	66.40 kB	65.35 kB
facebook-react-native/react-test-renderer/cjs/ReactTestRenderer-dev.js	=	615.98 kB	603.76 kB	=	98.61 kB	96.99 kB

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