refactor!: use ImportManifestEntry.async for async client reference module

[hi-ogawa]

It looks like this is now possible thanks to this PR:

• [Flight] Respect async flag in client manifest facebook/react#30959

We need to wait for next nightly release.

---

Actually I'd like the same thing for server reference and I would imagine Next.js also needs it to handle top-level-await similarly for server reference? That would help removing my yet another hack here:

vite-plugins/packages/react-server/src/plugin/index.ts

Lines 249 to 252 in 91e8e74

	// make server reference async for simplicity (stale chunkCache, etc...)
	// see TODO in https://github.com/facebook/react/blob/33a32441e991e126e5e874f831bd3afc237a3ecf/packages/react-server-dom-webpack/src/ReactFlightClientConfigBundlerWebpack.js#L131-L132
	code = code.replaceAll("if (isAsyncImport(metadata))", "if (true)");
	code = code.replaceAll("4 === metadata.length", "true");

[hi-ogawa]

• refactor: support async server reference (experiment) #648
• refactor!: use ImportManifestEntry.async for async client reference module #643 👈
• main

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