test for bug reproduction

[alexanderniebuhr]

@matthewp this adds a test to reproduce the issue:

1. pnpm i && pnpm run build
2. node --test "packages/astro/test/ssr-prerender-chunk.test.js"
3. Open packages/astro/test/fixtures/ssr-prerender-chunks/dist/_worker.js/renderers.mjs
4. Follow the imports from that file import { r as reactExports, R as React } from './chunks/prerender_dvgq6Avf.mjs';
5. Open packages/astro/test/fixtures/ssr-prerender-chunks/dist/_worker.js/chunks/prerender_dvgq6Avf.mjs
6. See that the chunking tries to import from a file with noop content

It is not possible to test this with the exisiting testAdapter, since that relies on fs and also doesn't use a real serverEntrypoint but a Vite virtual import. I expect this is an issue with manualChunks settings of Astro core, but it might could be also an issue with some settings for the serverless-test-adapter. Still I'm very lost and would love to get help & or a fix!

(Maybe @bluwy has also an idea 🤔)

As my debugging goes the following issues are downstream issues caused by this:

• Cloudflare v10 + Solid breaks some components and scripts adapters#224
• Cloudflare v10 breaks cloudflare build / wrangler preview with React adapters#211
• QRCode Issues adapters#233
• Cloudflare v10 navigating to a non-existent page (404) with React causes react minified errors with Wrangler adapters#214

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