Update devcontainer to include git autorefresh and npm start (#53568)

Author: heiskr

.devcontainer/devcontainer.json

@@ -19,7 +19,8 @@
       // Set *default* container specific settings.json values on container create.
       "settings": {
         "terminal.integrated.shell.linux": "/bin/bash",
-        "cSpell.language": ",en"
+        "cSpell.language": ",en",
+        "git.autofetch": true
       },
       // Visual Studio Code extensions which help authoring for docs.github.com.
       "extensions": [
@@ -57,7 +58,7 @@
   },
 
   // Use 'postCreateCommand' to run commands after the container is created.
-  "postCreateCommand": "npm ci",
+  "postCreateCommand": "npm ci && npm start",
 
   // Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
   "remoteUser": "node",