ML extension - revised button component (#12674)

* Revert "Revert "ML extension updates  (#11817)" (#12645)"

This reverts commit 34a6200a47.

* Modified button template and renamed infoButton ElementRef

* fix rendering issue

* Minor code cleanup.

* add clean up previous button logic

Co-authored-by: Alan Ren <alanren@microsoft.com>

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

@@ -12,7 +12,7 @@ export interface IButtonStyles extends vsIButtonStyles {
 }
 
 export class Button extends vsButton {
-	private buttonFocusOutline?: Color;
+	protected buttonFocusOutline?: Color;
 
 	constructor(container: HTMLElement, options?: IButtonOptions) {
 		super(container, options);