Fixing bugs for migration extension private preview 1. (#14872)

* Fixing Database backup page target layout

* Filtering out Azure sql db issues from assessment results
Correcting the database count for issued databases in sku rec page.

* Adding copy migration details button to migration status

* Adding start migration button to toolbar

* Fixing a syntax error in package.json

* Adding rg and location to target selection page
Filtering storage account by target location.

* Fixing dashboard title to azure sql migration

* Not making assessment targets selected by default.

* Adding tooltip for database and instance table items.

* Fixing duplicate task widget

* Some fixes mentioned in the PR
Localizing button text
renaming  a var
changing null to undefined.

* Adding enum for Migration target types

* Fixing a critical multi db migration bug because of unhandled race condition

* Adding Azure location api to azure core

* Adding source database info in status

extensions/sql-migration/package.json

@@ -2,7 +2,7 @@
   "name": "sql-migration",
   "displayName": "%displayName%",
   "description": "%description%",
-  "version": "0.0.4",
+  "version": "0.0.5",
   "publisher": "Microsoft",
   "preview": true,
   "license": "https://raw.githubusercontent.com/Microsoft/azuredatastudio/main/LICENSE.txt",