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/mainThreadWebviewViews.ts

@@ -28,7 +28,7 @@ export class MainThreadWebviewsViews extends Disposable implements extHostProtoc
 		this._proxy = context.getProxy(extHostProtocol.ExtHostContext.ExtHostWebviewViews);
 	}
 
-	dispose() {
+	override dispose() {
 		super.dispose();
 
 		dispose(this._webviewViewProviders.values());