Show RBAC notification only once per account item.

Sometimes the resource tree continously refreshes all expanded nodes
and if authentication fails the RBAC notification pops up again and again.

With this change we show the notification only once for each account node.
Refreshing the parent (resource group) node will create a new instance
and show the notification again.

src/docdb/tree/DocDBAccountTreeItemBase.ts

@@ -24,7 +24,7 @@ import { DocDBTreeItemBase } from './DocDBTreeItemBase';
 export abstract class DocDBAccountTreeItemBase extends DocDBTreeItemBase<DatabaseDefinition & Resource> {
     public readonly label: string;
     public readonly childTypeLabel: string = "Database";
-
+    private rBacNotificationShown: boolean = false;
 
     constructor(
         parent: AzExtParentTreeItem,
@@ -93,7 +93,8 @@ export abstract class DocDBAccountTreeItemBase extends DocDBTreeItemBase<Databas
             try {
                 return await super.loadMoreChildrenImpl(clearCache, context);
             } catch (e) {
-                if (e instanceof Error && isRbacException(e)) {
+                if (e instanceof Error && isRbacException(e) && !this.rBacNotificationShown) {
+                    this.rBacNotificationShown = true;
                     const principalId = await getSignedInPrincipalIdForAccountEndpoint(this.root.endpoint) ?? '';
                     // chedck if the principal ID matches the one that is signed in, otherwise this might be a security problem, hence show the error message
                     if (e.message.includes(`[${principalId}]`) && await ensureRbacPermission(this, principalId, context)) {