Write Diff Train import branch to this repo

[bigfootjon]

For fbsource we've historically used a separate repo for imports due to internal limitations in Diff Train. Those have been lifted so we can now commit this branch here and then we can import from this repo (and get rid of the other repo)

[react-sizebot]

Comparing: ea24427...a8888ca

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.min.js	=	168.90 kB	168.91 kB	=	52.93 kB	52.93 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	170.56 kB	170.56 kB	=	53.43 kB	53.43 kB
facebook-www/ReactDOM-prod.classic.js	=	590.81 kB	590.81 kB	=	103.90 kB	103.90 kB
facebook-www/ReactDOM-prod.modern.js	=	566.62 kB	566.62 kB	=	100.09 kB	100.09 kB
test_utils/ReactAllWarnings.js	Deleted	64.44 kB	0.00 kB	Deleted	16.10 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
test_utils/ReactAllWarnings.js	Deleted	64.44 kB	0.00 kB	Deleted	16.10 kB	0.00 kB

Generated by 🚫 dangerJS against a8888ca