Add FB build for ReactReconcilerConstants

[jackpope]

In order to integrate the react-reconciler build created in #28880 with third party libraries, we need to have matching react-reconciler/constants to go with it.

[kassens]

We might have to update some sync config. Let's see

[react-sizebot]

Comparing: 46abd7b...947111a

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	=	6.66 kB	6.66 kB	=	1.82 kB	1.82 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	492.61 kB	492.61 kB	=	87.88 kB	87.88 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	+0.11%	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	498.86 kB	498.86 kB	=	88.93 kB	88.93 kB
facebook-www/ReactDOM-prod.classic.js	=	591.22 kB	591.22 kB	=	103.96 kB	103.96 kB
facebook-www/ReactDOM-prod.modern.js	=	567.44 kB	567.44 kB	=	100.36 kB	100.36 kB
facebook-www/ReactReconcilerConstants-dev.classic.js	+∞%	0.00 kB	1.29 kB	+∞%	0.00 kB	0.51 kB
facebook-www/ReactReconcilerConstants-dev.modern.js	+∞%	0.00 kB	1.29 kB	+∞%	0.00 kB	0.51 kB
facebook-www/ReactReconcilerConstants-prod.classic.js	+∞%	0.00 kB	0.54 kB	+∞%	0.00 kB	0.32 kB
facebook-www/ReactReconcilerConstants-prod.modern.js	+∞%	0.00 kB	0.54 kB	+∞%	0.00 kB	0.32 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 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	+∞%	0.00 kB	1.29 kB	+∞%	0.00 kB	0.51 kB
facebook-www/ReactReconcilerConstants-dev.modern.js	+∞%	0.00 kB	1.29 kB	+∞%	0.00 kB	0.51 kB
facebook-www/ReactReconcilerConstants-prod.classic.js	+∞%	0.00 kB	0.54 kB	+∞%	0.00 kB	0.32 kB
facebook-www/ReactReconcilerConstants-prod.modern.js	+∞%	0.00 kB	0.54 kB	+∞%	0.00 kB	0.32 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Generated by 🚫 dangerJS against 947111a