New runtime mocker is not able to handle submodules

[dbritto-dev]

Describe the bug

vi.mock is not able to handle submodules like @radix-ui/react-select. For instance @radix-ui/react-select end up @radix-ui but @radix-ui/reactselect works

I believe the issue was introduced here -> a48be6ff

Reproduction

https://stackblitz.com/edit/vitejs-vite-zkej29?file=src%2Fbug.test.tsx,vitest.config.ts,vite.config.ts&terminal=dev

System Info

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:
    @vitejs/plugin-react: ^4.3.1 => 4.3.1 
    vite: ^5.4.2 => 5.4.2 
    vitest: ^2.0.5 => 2.0.5

Used Package Manager

npm

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[sheremet-va]

This is fixed in 2.1.0: #6266