Failing test case for deeply nested Suspense in Fallback

[gnoff]

When a deep Suspense boundary is partially complete before a parent boundary resolves it can trigger a scenario that React thinks is a bug. This change implements a test case demonstrating this bug. It does not solve it

Can't actually merge til we fix

[react-sizebot]

Comparing: b175988...27bcc64

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	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	530.07 kB	530.07 kB	=	93.57 kB	93.57 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	651.16 kB	651.16 kB	=	114.70 kB	114.70 kB
facebook-www/ReactDOM-prod.classic.js	=	676.11 kB	676.11 kB	=	118.97 kB	118.97 kB
facebook-www/ReactDOM-prod.modern.js	=	666.39 kB	666.39 kB	=	117.36 kB	117.36 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 27bcc64

[gnoff]

test incorporated into #33467 and fixed there