Adding get Migration Controller API to azure core. (#13991)

* - Adding null checks for onValueChanged
- Adding new event for radiobuttons onDIdChangeCheckedState

* Adding get MigrationController API to azure core.

* string templating
fixed typings

* Fixed typing and sorting logic

* Made the undefined check logic concise.

extensions/azurecore/src/extension.ts

@@ -196,6 +196,13 @@ export async function activate(context: vscode.ExtensionContext): Promise<azurec
 			ignoreErrors: boolean): Promise<azurecore.GetFileSharesResult> {
 			return azureResourceUtils.getFileShares(account, subscription, storageAccount, ignoreErrors);
 		},
+		getMigrationControllers(account: azdata.Account,
+			subscription: azureResource.AzureResourceSubscription,
+			resourceGroupName: string,
+			regionName: string,
+			ignoreErrors: boolean): Promise<azurecore.GetMigrationControllersResult> {
+			return azureResourceUtils.getMigrationControllers(account, subscription, resourceGroupName, regionName, ignoreErrors);
+		},
 		getRegionDisplayName: utils.getRegionDisplayName,
 		runGraphQuery<T extends azureResource.AzureGraphResource>(account: azdata.Account,
 			subscriptions: azureResource.AzureResourceSubscription[],