Mark the roslynCopilot dependency as optional

Author: JoeRobich

package.json

@@ -414,7 +414,8 @@
         "neutral"
       ],
       "installTestPath": "./.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll",
-      "integrity": "0BD733B23A706226F2B429AB0CE35576FB474493C8E19C7B88311007876DE5CC"
+      "integrity": "0BD733B23A706226F2B429AB0CE35576FB474493C8E19C7B88311007876DE5CC",
+      "isOptional": true
     },
     {
       "id": "Debugger",