[Flight] Unwrap lazy before reading the value

[sebmarkbage]

This is important if the lazy is at the root of the chunk. I don't have a unit test for it but @gnoff has a repro.

It also shouldn't unwrap the last value since that's the one we're referencing.

This was already done correctly by @unstubbable in waitForReference so this just aligns with that.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 10, 2024 9:18pm

[react-sizebot]

Comparing: a5a7f10...80f40b1

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	=	1.82 kB	1.82 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	505.22 kB	505.22 kB	=	90.29 kB	90.29 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	+0.05%	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	512.56 kB	512.56 kB	=	91.52 kB	91.52 kB
facebook-www/ReactDOM-prod.classic.js	=	600.88 kB	600.88 kB	=	106.29 kB	106.29 kB
facebook-www/ReactDOM-prod.modern.js	=	577.17 kB	577.17 kB	=	102.43 kB	102.43 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

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