Update product references from 'sqlops' to 'azdata' (#4259)

* Update extensions to use azdata

* Switch core code to use azdata

extensions/azurecore/src/azureResource/messageTreeNode.ts

@@ -6,7 +6,7 @@
 'use strict';
 
 import { TreeItem, TreeItemCollapsibleState } from 'vscode';
-import { NodeInfo } from 'sqlops';
+import { NodeInfo } from 'azdata';
 
 import { TreeNode } from './treeNode';
 import { AzureResourceItemType } from './constants';