Remove enableClientRenderFallbackOnTextMismatch flag

[sebmarkbage]

Build on top of #28440.

This lets us remove the path where updates are tracked on differences in text.

[react-sizebot]

Comparing: 670d61bea23470e980ba13c1c8441e375779b0b8...e68826abbaeeaf3ef7e67a172ddfcb41a49c3efb

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	=	175.94 kB	175.91 kB	=	54.54 kB	54.53 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	172.42 kB	172.39 kB	=	53.72 kB	53.70 kB
facebook-www/ReactDOM-prod.classic.js	=	590.84 kB	589.86 kB	=	103.76 kB	103.60 kB
facebook-www/ReactDOM-prod.modern.js	=	574.36 kB	573.39 kB	=	100.83 kB	100.66 kB
test_utils/ReactAllWarnings.js	Deleted	64.83 kB	0.00 kB	Deleted	16.08 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	64.83 kB	0.00 kB	Deleted	16.08 kB	0.00 kB

Generated by :no_entry_sign: dangerJS against e68826abbaeeaf3ef7e67a172ddfcb41a49c3efb