Inform screen-readers of Dacpac Deploy loading and loading complete for summary (#7000)

* Loading components now announce themselves.  Likely need way to disable.

* Adding focus elements to table for screen-reading after component is loaded in

* Adding piping for aria roles on tables

* Alerting on completion of deploy plan summary

* Removing extra ariaLive property

src/sql/base/browser/ui/table/table.ts

@@ -359,4 +359,8 @@ export class Table<T extends Slick.SlickData> extends Widget implements IDisposa
 	public set ariaColumnCount(value: number) {
 		this._tableContainer.setAttribute('aria-colcount', value.toString());
 	}
+
+	public set ariaRole(value: string) {
+		this._tableContainer.setAttribute('role', value);
+	}
 }