Tests: Fix flaky interactivity deferred test (#61359)

Fix flaky test #59899

> Locator: getByTestId('result')
> Expected string: ""
> Received string: "Hello, world!"

The test expects to find some empty HTML initially, then find updated text. The text is updated on a timeout.
I suspect the timeout is too short, causing this the flakiness.

Double the timeout to make the test more reliable.

packages/e2e-tests/plugins/interactive-blocks/deferred-store/view.js

@@ -16,5 +16,5 @@ document.addEventListener( 'DOMContentLoaded', () => {
 				},
 			},
 		} );
-	}, 50 );
+	}, 100 );
 } );