feat(markdown-preview): Migrate editor and renderer services to ESM

Author: hivanalejandro

run/markdown-preview/editor/package.json

@@ -5,6 +5,7 @@
   "private": true,
   "license": "Apache-2.0",
   "author": "Google LLC",
+  "type": "module",
   "repository": {
     "type": "git",
     "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
@@ -31,4 +32,4 @@
     "mocha": "^10.0.0",
     "supertest": "^7.0.0"
   }
-}
+}

run/markdown-preview/renderer/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "license": "Apache-2.0",
   "author": "Google LLC",
+  "type": "module",
   "repository": {
     "type": "git",
     "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
@@ -31,4 +32,4 @@
     "sinon": "^18.0.0",
     "supertest": "^7.0.0"
   }
-}
+}