Refactor FXIOS-10576 Simplify the MockStoreForMiddleware and middleware test action type unwrapping

[ih-codes]

:scroll: Tickets

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:bulb: Description

This PR simplifies the MockStoreForMiddleware a little bit (the count was redundant), which lets us improve the naming. As well, simplify our middleware test action type guards using XCTUnwrap, which throws (and cancels the test execution) if the unwrapped action is the incorrect type. That means we mark our unit tests with the throw keyword.

Demo

Here is an example of what it looks like if a test fails due to an incorrect type being dispatched to the store. Note that we can still easily use the type to access the action's variables with this method.

:pencil: Checklist

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• [x] Filled in the above information (tickets numbers and description of your work)
• [x] Updated the PR name to follow our PR naming guidelines
• [x] Wrote unit tests and/or ensured the tests suite is passing
• [ ] When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• [ ] If needed, I updated documentation / comments for complex code and public methods
• [ ] If needed, added a backport comment (example @Mergifyio backport release/v120)

[mobiletest-ci-bot]

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