Don't register chat setup setting (microsoft#235675)

Author: roblourens

src/vs/workbench/contrib/chat/browser/chat.contribution.ts

@@ -126,7 +126,8 @@ configurationRegistry.registerConfiguration({
 			default: false,
 			scope: ConfigurationScope.APPLICATION,
 			markdownDescription: nls.localize('chat.experimental.offerSetup', "Controls whether setup is offered for Chat if not done already."),
-			tags: ['experimental', 'onExP']
+			tags: ['experimental', 'onExP'],
+			included: false
 		},
 		'chat.editing.alwaysSaveWithGeneratedChanges': {
 			type: 'boolean',