Add persistence and connect dialog to Arc view (#11014)

* Add controller persistence and info prompting

* more stuff

* clean up

* Add arc tests to scripts

extensions/arc/src/ui/tree/refreshTreeNode.ts

@@ -0,0 +1,25 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import * as loc from '../../localizedConstants';
+import { TreeNode } from './treeNode';
+import { refreshActionId } from '../../constants';
+
+/**
+ * A placeholder TreeNode to display when credentials weren't entered
+ */
+export class RefreshTreeNode extends TreeNode {
+
+	constructor(private _parent: TreeNode) {
+		super(loc.refreshToEnterCredentials, vscode.TreeItemCollapsibleState.None, 'refresh');
+	}
+
+	public command: vscode.Command = {
+		command: refreshActionId,
+		title: loc.refreshToEnterCredentials,
+		arguments: [this._parent]
+	};
+}