[Bug] Devant env check is always true

### Bug Description

The environment check for Devant is always true in `devant main sync` branch

### Steps to Reproduce

Run Ballerina ext in `devant main sync` branch

### Expected Behavior

It should be true only in the Devant editor

### Screenshots

_No response_

### Environment (OS, VS Code version, Extension version, Node.js version)

_No response_

### Additional Context

_No response_