Add more E2E tests to deployment platforms and runtimes

[SferaDev]

Functions:

• [ ] Vercel Serverless Functions (Node v16)
• [x] CF Workers (V8)
• [ ] Netlify Edge Functions (Deno)

Sites:

• [x] Vercel (Next.js)
• [x] CF Pages (Remix)
• [ ] Netlify (SvelteKit)

Other:

• [x] Rollup bundle with browser eval (like our SDK playground)
• [ ] WASM with Fastly Compute@edge