test: disable flaky `<webview>.capturePage()` specs (#41713)

test: disable flaky <webview>.capturePage() specs

spec/webview-spec.ts

@@ -14,8 +14,6 @@ import { HexColors, ScreenCapture } from './lib/screen-helpers';
 declare let WebView: any;
 const features = process._linkedBinding('electron_common_features');
 
-const isMacArm64 = (process.platform === 'darwin' && process.arch === 'arm64');
-
 async function loadWebView (w: WebContents, attributes: Record<string, string>, opts?: {openDevTools?: boolean}): Promise<void> {
   const { openDevTools } = {
     openDevTools: false,
@@ -2107,9 +2105,8 @@ describe('<webview> tag', function () {
       }
     });
 
-    // TODO(miniak): figure out why this is failing on windows
-    // TODO(vertedinde): figure out why this is failing on mac arm64
-    ifdescribe(process.platform !== 'win32' && !isMacArm64)('<webview>.capturePage()', () => {
+    // FIXME: This test is flaking constantly on Linux and macOS.
+    xdescribe('<webview>.capturePage()', () => {
       it('returns a Promise with a NativeImage', async function () {
         this.retries(5);