vite: fix server export dead-code elimination for routes outside of app dir #1219

Job	Run time
👀 Integration Test / windows-latest / node@20.5.1 / msedge	27m 8s
👀 Integration Test / windows-latest / node@20.5.1 / msedge	14m 38s
👀 Integration Test / ubuntu-latest / node@20.5.1 / firefox	11m 32s
👀 Integration Test / ubuntu-latest / node@20.5.1 / firefox	11m 32s
👀 Integration Test / macos-latest / node@20.5.1 / webkit	21m 5s
👀 Integration Test / macos-latest / node@20.5.1 / webkit	21m 5s
🧪 Unit Test / windows-latest / node@20.5.1	5m 43s
🧪 Unit Test / windows-latest / node@20.5.1	5m 43s
	1h 58m 26s

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