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/azdata.d.ts

@@ -2951,6 +2951,8 @@ declare module 'azdata' {
 		title?: string;
 		ariaRowCount?: number;
 		ariaColumnCount?: number;
+		ariaRole?: string;
+		focused?: boolean;
 		moveFocusOutWithTab?: boolean; //accessibility requirement for tables with no actionable cells
 	}