cli: remove outdated logic in load-vite-config.ts in future update

Tracking issue for a TODO found in `packages/cli/src/bin/helpers/load-vite-config.ts`:

```ts
// todo - remove in future update
```

Follow up and remove/clean up this code in a future update once the underlying condition it was working around is no longer needed.

Start by reading packages/cli/src/bin/helpers/load-vite-config.ts around the TODO and trace the underlying condition it currently works around. Confirm that condition is no longer needed before removing or cleaning up the outdated logic; done means the workaround and TODO are gone without changing required Vite configuration loading.

Written by the indexing model from the issue text.