[c3] Bump create-vite to 8.3.0 and update React test expected text

[ascorbic]

Supersedes #11859.

create-vite 8.x changed the default React template's <title> from Vite + React + TS to the project name. Since the C3 E2E tests verify the page content via a fetch request (no client-side JS execution), they only see the static HTML — which no longer contains the old title text.

This PR:

• Bumps create-vite from 7.1.1 to 8.3.0 (same as [C3] Bump create-vite from 7.1.1 to 8.2.0 in /packages/create-cloudflare/src/frameworks #11859)
• Updates the React test expectedText from "Vite + React" / "Vite + React + TS" to '<div id="root">' — the React mount point that's always present in the static HTML

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: No user-facing behavior change beyond the dep bump

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Latest commit: b75bcb3

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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[pkg-pr-new]

create-cloudflare

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@cloudflare/kv-asset-handler

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@cloudflare/unenv-preset

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@cloudflare/workers-editor-shared

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@cloudflare/workers-utils

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wrangler

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commit: b75bcb3