Improve notebook link handling (#6087)

* Improve notebook link handling
- Single click now works for links inside Output areas
- Command links in untrusted notebooks have link color
- Refactored to use directive so code is in 1 place and can be easily
  added elsewhere if needed

* Removed unneeded service from constructor

src/sql/workbench/parts/notebook/cellViews/outputArea.component.ts

@@ -44,6 +44,10 @@ export class OutputAreaComponent extends AngularDisposable implements OnInit {
 		}
 	}
 
+	public get isTrusted(): boolean {
+		return this.cellModel.trustedMode;
+	}
+
 	private setFocusAndScroll(node: HTMLElement): void {
 		if (node) {
 			node.focus();