Describe the bug

On watch mode, if a project uses a vitest workspace config (either a workspace/project file, or test.workspace notation in vite config), changes to the set up file are not picked up.

Example:

import { defineConfig } from 'vite';

export default defineConfig({
  test: {
    workspace: [
      {
        test: {
          setupFiles: ['setup-file.ts'], // making changes here won't trigger re-tests
        },
      },
    ],
  },
});

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-dngrkwsn?file=setup-file.ts,vite.config.ts&initialPath=__vitest__/

System Info

System:
    OS: Linux 5.0
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @vitest/ui: latest => 3.1.3 
    vite: latest => 6.3.5 
    vitest: latest => 3.1.3

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.