Remove step which moved to the vscode CI

.github/workflows/ci.yml

@@ -65,19 +65,6 @@ jobs:
         run: |
           yarn gulp editor-distro
 
-      - name: Typings validation prep
-        run: |
-          mkdir typings-test
-
-      - name: Typings validation
-        working-directory: ./typings-test
-        run: |
-          yarn init -yp
-          yarn add typescript
-          yarn tsc --init
-          echo "import '../vscode/out-monaco-editor-core';" > a.ts
-          yarn tsc --noEmit
-
       - name: NPM Install
         run: npm install