Change Azure region dropdown to use azurecore API (#11131)

* Change Azure region dropdown to use azurecore API for getting display name

* Fix compile errors

* Adding a few things to the vscodeignore

* and another

extensions/resource-deployment/src/ui/wizardPageBase.ts

@@ -23,7 +23,7 @@ export abstract class WizardPageBase<T> {
 		return this._wizard;
 	}
 
-	public onEnter(): void { }
+	public async onEnter(): Promise<void> { }
 
 	public onLeave(): void { }