[vitest-plugin] Stabilize Vite mode config test

[edmundhung]

Split the Vite mode configuration test into two independent tests: one covering the default test mode and one covering an explicit --mode=staging override.

The original test launched Vitest twice under a single 15-second timeout and had started timing out on loaded Linux and macOS CI runners. Each new test launches Vitest once and retains the package's default timeout.

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• 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: This only reorganizes an internal test.

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