Isolate option doesn't work when run in workspace mode

[paulintrognon]

Describe the bug

I have 2 projects in my workspace, one in isolate mode and not the other, but it appears that both are isolated, as if the isolate option was not supported in workspaces. I guess it's as intended and an * is missing from the docs (like https://github.com/vitest-dev/vitest/issues/5933)

Reproduction

import { defineWorkspace } from 'vitest/config'

export default defineWorkspace([
  {
    extends: './vitest.e2e-config.ts',
    test: {
      name: 'e2e-isolated',
      include: ['**/*.e2e-spec.isolated.ts'],
      isolate: true,
    },
  },
  {
    extends: './vitest.e2e-config.ts',
    test: {
      name: 'e2e-shared',
      include: ['**/*.e2e-spec.ts'],
      isolate: false, // Does not work, tests are still isolated
    },
  },
])

System Info

System:
    OS: Linux 5.15 Ubuntu 20.04.6 LTS (Focal Fossa)
    CPU: (12) x64 Intel(R) Core(TM) i7-10850H CPU @ 2.70GHz
    Memory: 17.76 GB / 30.95 GB
    Container: Yes
    Shell: 5.0.17 - /bin/bash
  Binaries:
    Node: 20.15.1 - ~/.nvm/versions/node/v20.15.1/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v20.15.1/bin/yarn
    npm: 10.7.0 - ~/.nvm/versions/node/v20.15.1/bin/npm
    Watchman: 20210821.022905.0 - /usr/local/bin/watchman
  Browsers:
    Chrome: 127.0.6533.72
    Chromium: 126.0.6478.182
  npmPackages:
    @vitest/coverage-v8: 2.0.3 => 2.0.3 
    vitest: 2.0.3 => 2.0.3

Used Package Manager

yarn

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• [X] Read the Contributing Guidelines.
• [X] Read the docs.
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• [X] The provided reproduction is a minimal reproducible example of the bug.