[cherry-pick] disable user prompts synchronization in stable (microsoft#242595)

disable user prompts synchronization in stable

Author: legomushroom

src/vs/workbench/contrib/userDataSync/browser/userDataSync.ts

@@ -575,8 +575,10 @@ export class UserDataSyncWorkbenchContribution extends Disposable implements IWo
 			label: getSyncAreaLabel(SyncResource.Profiles),
 		}];
 
-		// if the `reusable prompt` feature is enabled, add appropriate item to the list
-		if (PromptsConfig.enabled(this.configService)) {
+		// if the `reusable prompt` feature is enabled and in vscode
+		// insiders, add the `Prompts` resource item to the list
+		const isInsiders = (this.productService.quality !== 'stable');
+		if (PromptsConfig.enabled(this.configService) && isInsiders) {
 			result.push({
 				id: SyncResource.Prompts,
 				label: getSyncAreaLabel(SyncResource.Prompts)