Remove RTR from ReactProfiler-test

[jackpope]

Summary

Internal cleanup of ReactTestRenderer

How did you test this change?

yarn test packages/react/src/__tests__/ReactProfiler-test.internal.js

[react-sizebot]

Comparing: 56e20051c3c1611f9495081d01f1946184332c6b...c00d1048970aeb935b47e7b0f803d575b64388ef

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	=	177.10 kB	177.10 kB	=	55.20 kB	55.20 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	177.64 kB	177.64 kB	=	55.53 kB	55.53 kB
facebook-www/ReactDOM-prod.classic.js	=	593.92 kB	593.92 kB	=	104.85 kB	104.85 kB
facebook-www/ReactDOM-prod.modern.js	=	577.18 kB	577.18 kB	=	101.91 kB	101.91 kB
test_utils/ReactAllWarnings.js	Deleted	66.60 kB	0.00 kB	Deleted	16.28 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	66.60 kB	0.00 kB	Deleted	16.28 kB	0.00 kB

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