Add override keyword in codebase (#120755)

For #120675

This uses a script to add the override keyword to places that need it in the codebase

Note that we can't enable the --noImplicitOverride setting yet since there are still around 200 errors that require further attention

src/vs/workbench/api/browser/mainThreadWebviewPanels.ts

@@ -123,7 +123,7 @@ export class MainThreadWebviewPanels extends Disposable implements extHostProtoc
 		}));
 	}
 
-	dispose() {
+	override dispose() {
 		super.dispose();
 
 		dispose(this._editorProviders.values());