refactor(env)!: rename VITE_PLUS_* env vars to VP_* prefix #4021

Job	Run time
detect-changes	5s
download-previous-rolldown-binaries	9s
Build vite-plus packages (windows-latest)	13m 27s
Build vite-plus packages (ubuntu-latest)	4m 55s
rollipop E2E test (ubuntu-latest)	1m 35s
frm-stack E2E test (ubuntu-latest)	1m 32s
tanstack-start-helloworld E2E test (ubuntu-latest)	48s
vue-mini E2E test (ubuntu-latest)	50s
vitepress E2E test (ubuntu-latest)	1m 40s
vibe-dashboard E2E test (ubuntu-latest)	1m 2s
oxlint-plugin-complexity E2E test (ubuntu-latest)	50s
vite-vue-vercel E2E test (ubuntu-latest)	44s
viteplus-ws-repro E2E test (windows-latest)	2m 8s
tanstack-start-helloworld E2E test (windows-latest)	2m 15s
bun-vite-template E2E test (ubuntu-latest)	50s
npmx.dev E2E test (ubuntu-latest)	2m 36s
vibe-dashboard E2E test (windows-latest)	2m 18s
vite-plus-jest-dom-repro E2E test (ubuntu-latest)	44s
oxlint-plugin-complexity E2E test (windows-latest)	2m 39s
vite-vue-vercel E2E test (windows-latest)	2m 57s
vp-config E2E test (windows-latest)	1m 53s
dify E2E test (ubuntu-latest)	5m 21s
yaak E2E test (ubuntu-latest)	1m 10s
reactive-resume E2E test (ubuntu-latest)	1m 47s
vue-mini E2E test (windows-latest)	2m 37s
vitepress E2E test (windows-latest)	3m 13s
reactive-resume E2E test (windows-latest)	3m 34s
viteplus-ws-repro E2E test (ubuntu-latest)	40s
vp-config E2E test (ubuntu-latest)	45s
vite-plus-jest-dom-repro E2E test (windows-latest)	2m 53s
rollipop E2E test (windows-latest)	3m 49s
bun-vite-template E2E test (windows-latest)	3m 38s
vinext E2E test (ubuntu-latest)	5m 53s
Notify on failure	-1s
	1h 21m 16s

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