🤖 fix: guard VSCE publish step (#656)

## Summary
- wrap the VS Code Marketplace publish step condition in a GitHub
Actions expression so the parser can resolve the secrets context

## Testing
- make typecheck

_Generated with _

Author: ibetitsmike

.github/workflows/release.yml

@@ -77,7 +77,7 @@ jobs:
             --clobber
 
       - name: Publish to VS Code Marketplace
-        if: secrets.VSCE_PAT != ''
+        if: ${{ secrets.VSCE_PAT != '' }}
         working-directory: vscode
         env:
           VSCE_PAT: ${{ secrets.VSCE_PAT }}