[BUG]: Drizzle kit does not report when schema is missing from the given location in drizzle.config.ts

### What version of `drizzle-orm` are you using?

0.28.6

### What version of `drizzle-kit` are you using?

0.19.13

### Describe the Bug

I moved `schema.ts` to somewhere else, as a part of cleaning my repo, but forgot to update the location in `drizzle.config.ts`.
After some days, when I launched Drizzle Studio, it did not display any tables, and it was hard to figure out what's actually going wrong.

Here's my command from package.json:

```json
"db:studio": "drizzle-kit studio --config=drizzle.config.ts"
```

### Expected behavior

Drizzle-kit should ideally throw an error when the schema file is not found at the defined location in `drizzle.config.ts` to make it easier for users to catch this issue.

### Environment & setup

My platform:

Node version: v20.6.1
pnpm version: 8.8.0
OS: Fedora 38 x64
CPU: AMD Ryzen 9 3900X