regiters markdown editor commands as vscode commands, so that shortcuts can be customized

.github/workflows/pr.yml

@@ -82,6 +82,9 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Check Markdown editor package.json
+        run: npm run markdown-editor-package-json-check
+
       - name: Compile & Hygiene
         run: npm exec -- npm-run-all2 -lp core-ci hygiene eslint valid-layers-check define-class-fields-check vscode-dts-compile-check tsec-compile-check test-build-scripts
         env:
@@ -425,5 +428,3 @@ jobs:
       - name: Run Completions Core lib tests using VS Code
         working-directory: extensions/copilot
         run: npm run test:completions-core
-
-