Arc public preview updates (#12329)

* Arc public preview updates

* disable PG dashboards again

extensions/arc/README.md

@@ -2,7 +2,7 @@
 
 Welcome to Microsoft Azure Arc Extension for Azure Data Studio!
 
-**This extension is only applicable to customers in the Azure Arc data services private preview.**
+**This extension is only applicable to customers in the Azure Arc data services public preview.**
 
 ## Overview
 

extensions/arc/package.json

@@ -2,7 +2,7 @@
   "name": "arc",
   "displayName": "%arc.displayName%",
   "description": "%arc.description%",
-  "version": "0.3.5",
+  "version": "0.4.0",
   "publisher": "Microsoft",
   "preview": true,
   "license": "https://raw.githubusercontent.com/Microsoft/azuredatastudio/main/LICENSE.txt",