[DevTools] Fix moduleNameMapper Order in DevTools Config

[lunaruan]

We need the regression config moduleNameMapper to come before the current moduleNameMapper so when it tries to map "/^react-dom\/([^/]+)$/ it doesn't get confused.

[sizebot]

Comparing: 210fee4...e4e11ee

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	=	131.49 kB	131.49 kB	=	42.14 kB	42.14 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	136.75 kB	136.75 kB	=	43.70 kB	43.70 kB
facebook-www/ReactDOM-prod.classic.js	=	441.13 kB	441.13 kB	=	80.41 kB	80.41 kB
facebook-www/ReactDOM-prod.modern.js	=	426.42 kB	426.42 kB	=	78.24 kB	78.24 kB
facebook-www/ReactDOMForked-prod.classic.js	=	441.13 kB	441.13 kB	=	80.41 kB	80.41 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against e4e11ee

[mondaychen]

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