fix: load jsdom before SSR build

[userquin]

tested on https://github.com/userquin/vite-ssg-esm-cli-150 with mock and cjs and https://github.com/userquin/vite-ssg-build-v-client-master with mock

fix #230
fix #51
fix #254

[userquin]

maybe we can register global jsdom before loading the ssr entry instead before ssr build