e2e: Further fix flaky Twitter test (#95672)

PR #95579 attempted to adjust the test to accept both the expected
iframe and the fallback link produced when Twitter's API is flaky.
Unfortunately the way Playwright interpreted the code is like
`iframe > ( tweet or link )` rather than `( iframe > tweet ) or link` as
intended, so it's still not finding the link.

Fall back to using `Promise.any()` to combine the two locators instead,
like we do in a bunch of other places.

packages/calypso-e2e/src/lib/blocks/block-flows/twitter.ts

@@ -60,12 +60,12 @@ export class TwitterBlockFlow implements BlockFlow {
 		// In most cases, the iframe will render, so look for that.
 		const iframeTweetLocator = context.page
 			.frameLocator( selectors.publishedTwitterIframe )
-			.locator( `text=${ this.configurationData.expectedTweetText }` );
+			.locator( `text=${ this.configurationData.expectedTweetText }` )
+			.first();
 
 		// However, sometimes only the bare link renders, so we need to check for that fallback.
-		const bareTweetLinkLocator = context.page.locator( selectors.publishedTwitterBareLink );
+		const bareTweetLinkLocator = context.page.locator( selectors.publishedTwitterBareLink ).first();
 
-		const tweetLocator = iframeTweetLocator.or( bareTweetLinkLocator ).first();
-		await tweetLocator.waitFor();
+		await Promise.any( [ iframeTweetLocator.waitFor(), bareTweetLinkLocator.waitFor() ] );
 	}
 }