Arc updates for March release (#14970)

* Updated Postgres Spec for where to find engine version, removed calling calling -ev in edit commands (#14735)

* Added spec.engine.version, took out calling engine version with edit calls

* Added text wrong place

* missed updates

* PR fix

* Update Arc Postgres troubleshooting notebook

Co-authored-by: Brian Bergeron <brberger@microsoft.com>

* Remove AzdataSession from azdata commands (#14856)

* remove session

* Add in controller-context support

* Revert "Add in controller-context support"

This reverts commit 3b39b968efbf6054041cb01cb2d8443532643a82.

* Add azdataContext to login

* Undo book change

* Undo change correctly

* Add controller context support (#14862)

* remove session

* Add in controller-context support

* Add params to fake

* Fix tests

* Add info and placeholder for controller URL/name (#14887)

* Add info and placeholder for controller URL

* add period + update name

* update memento and allow editing of namespace/URL

* vBump

* vBump

* Fix tests

Co-authored-by: nasc17 <69922333+nasc17@users.noreply.github.com>
Co-authored-by: Brian Bergeron <brian.e.bergeron@gmail.com>
Co-authored-by: Brian Bergeron <brberger@microsoft.com>

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

@@ -10,7 +10,7 @@ import { ControllerModel } from '../../models/controllerModel';
 import { ControllerTreeNode } from './controllerTreeNode';
 import { TreeNode } from './treeNode';
 
-const mementoToken = 'arcDataControllers';
+const mementoToken = 'arcDataControllers.v2';
 
 /**
  * The TreeDataProvider for the Azure Arc view, which displays a list of registered