Fix crash on screenshot target due to unhandled action dispatch

[iamgabrielma]

Found this one while trying to generate new screenshots for ASC

Description

WooCommerceScreenshots target crashes when running testScreenshots() due to unhandled actions that are dispatched through MockActionHandler

One review is enough. No rush to review/merge into 23.7, it's an internal crash only when we run the target, which doesn't run in CI 👍

Test Steps

• Switch to WooCommerceScreenshots
• Run WooCommerceScreenshots.testScreenshots()
• App should not crash. Test should pass*

* The first time I ran the tests all of them failed due to a Tap to Pay modal appearing in the middle of the screen, which wasn't dismissed automatically so tests couldn't navigate through the app to make screenshots. A second run worked fine. I'm guessing because we only show it once, but I'm unaware of the exact details at this point. If tests fail due to this reason please run them again, we can handle the tap to pay modal separately.

[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	pr16352-6062f08
	Version	23.6
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	6062f08
	Installation URL	1fbmds03c74ko

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

[joshheald]

Works well, one question

[joshheald]

Hmm. Should we actually have this default, if this is causing issues?

[iamgabrielma]

I'm in the middle about it:

I think we shouldn't use default in general to just hide from the compiler that the action hasn't been handled, despite being a mock it just forces a runtime error for no reason imho.

On the other side is not causing much trouble since only runs when we have to trigger the screenshot tests. I had to add a couple more actions here on a separate PR while working with WooCommerceScreenshots but that's about it. Updating it now means adding 67 actions to the switch statement that are missing 😅