Describe the bug

Docs now mentions it's not supported https://vitest.dev/api/vi.html#vi-setconfig But it's available as typing of vi.setConfig.

But it might be a regression and possible to make it work again #6653 (comment)

If not, we should update RuntimeConfig to hide it from typing.

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-opxrtz?file=repro.test.ts

(based on tests from #6652)

System Info

(stackblitz)

  System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 18.20.3 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.3 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @vitest/ui: 2.1.2 => 2.1.2 
    vite: latest => 5.4.8 
    vitest: 2.1.2 => 2.1.2

Used Package Manager

npm

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