Adding windows auth support to sql-migration and misc bug fixes. (#14816)

* - Added coming soon message for learn more.
- Potential fix for learn more message

* Renaming of controller to sqlMigrationService

* Surfacing some errors
-Azure account is stale error
-Migration Service creation error.

* Adding refresh azure token validation.

* Fixing some errors pointed during PR
-Fixing property names
-Fixing count

* Fixing migration status
- Adding special error handling for resource not found error
- Deleting unfound migrations from local cache
- Using prefetched migration status for view all

Misc fixes:
- Using SQL server version name instead of number
- Fixing Icons on sku recommendation page
- Fixing table column width in cutover dialog
- Adding spinner button to refresh.

* Fixing all strings in migration service page and dialog

* fixed a string error in create service dialog

* Adding source config page to migration to support windows auth
Some refactorings for sqlDatabaseTree (still WIP)

* refactoring assessments code 1
introducing new interface for server assessments

* Filtering out non windows sql vms
Retaining selections made by user on assessments dialog

* Fix compile errors on sqlDatabaseTree

* Exposing migration status errors in cutover dialog

* Updating extension verion

* Correcting typos
Fixing compilation erros
Removing en-us from url
Fixing function names
Make UI calls unblocking

* Unblocking dialog in case of failed assessments
Localizing string
removing blocking code from UI
Fixing comments

* Fixed broken assessment page logic

extensions/sql-migration/src/wizard/databaseBackupPage.ts

@@ -19,19 +19,19 @@ export class DatabaseBackupPage extends MigrationWizardPage {
 	private _windowsUserAccountText!: azdata.InputBoxComponent;
 	private _passwordText!: azdata.InputBoxComponent;
 	private _networkShareDatabaseConfigContainer!: azdata.FlexContainer;
-	private _networkShareLocations!: azdata.InputBoxComponent[];
+	private _networkShareLocations: azdata.InputBoxComponent[] = [];
 
 	private _blobContainer!: azdata.FlexContainer;
 	private _blobContainerSubscriptionDropdown!: azdata.DropDownComponent;
 	private _blobContainerStorageAccountDropdown!: azdata.DropDownComponent;
 	private _blobContainerDatabaseConfigContainer!: azdata.FlexContainer;
-	private _blobContainerDropdowns!: azdata.DropDownComponent[];
+	private _blobContainerDropdowns: azdata.DropDownComponent[] = [];
 
 	private _fileShareContainer!: azdata.FlexContainer;
 	private _fileShareSubscriptionDropdown!: azdata.DropDownComponent;
 	private _fileShareStorageAccountDropdown!: azdata.DropDownComponent;
 	private _fileShareDatabaseConfigContainer!: azdata.FlexContainer;
-	private _fileShareDropdowns!: azdata.DropDownComponent[];
+	private _fileShareDropdowns: azdata.DropDownComponent[] = [];
 
 	constructor(wizard: azdata.window.Wizard, migrationStateModel: MigrationStateModel) {
 		super(wizard, azdata.window.createWizardPage(constants.DATABASE_BACKUP_PAGE_TITLE), migrationStateModel);