Update gems to fix CI reporting of Swift Testing failures

[joshheald]

Merge after: #16083

Description

CI was not marking SwiftTesting test failures as failures in the unit test job. This is solved by an update to the trainer dependency of fastlane, which can handle the new format of .xctestresult that contains Swift Testing results. trainer continues to convert these to JUnit results and uploads them to the Test Engine.

We previously used fastlane 2.217. This PR updates us to 2.228, which includes the new trainer dependency.

See p1756990479360729-slack-CC7L49W13 for discussion/context

This PR also fixes some failing tests which were previously non-blocking, due to being written with SwiftTesting.

Steps to reproduce

1. Add a failing SwiftTesting test to a branch off this one
2. Push it to Github to run CI
3. Observe that the failing test blocks the merge.

Here's the tests failing from a previous commit

---

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr16088-178b11f
	Version	23.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	178b11f
	Installation URL	4c2gcptrhrnjo

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[joshheald]

Only one review needed

[staskus]

🚀 Good to know that it's solved.