vscode extension incorrectly flags "$TURBO_EXTENDS$" as deprecated env var


### Discussed in https://github.com/vercel/turborepo/discussions/12474

<div type='discussions-op-text'>

<sup>Originally posted by **stefanprobst** March 28, 2026</sup>
### Summary

full error message:

```
The $ syntax is deprecated. Please apply the codemod.(deprecated:env-var)
```


### Additional information

_No response_

### Example

_No response_</div>