test: misc fixes

[sapphi-red]

Description

• set __VUE_PROD_HYDRATION_MISMATCH_DETAILS__ to remove warning in browser: the following error was happening

  • Feature flag VUE_PROD_HYDRATION_MISMATCH_DETAILS is not explicitly defined. You are running the esm-bundler build of Vue, which expects these compile-time feature flags to be globally injected via the bundler config in order to get better tree-shaking in the production bundle.

    For more details, see https://link.vuejs.org/feature-flags.

• remove unused test code: this test was removed by feat(css): deprecate css default export #11094, feat(css)!: remove css default export #14125
• only run css-lightningcss-proxy test in dev: this test was doing the same thing in dev and build
• hide environment-react-ssr test output: hide the following log
  • https://github.com/vitejs/vite/actions/runs/11035372865/job/30651205246#step:13:230

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[hi-ogawa]

Looks good!