Check if app is running unit tests the Swift way

When writing tests that might invoke this function, with the animated parameter set to bool, in a normal behaviour `self.transitionCoordinator` is not nil when animated is set to true, but since no actual transition is happening (in a unit test), it is nil, and it breaks the completion block.

So I needed a way to set animation to false, even if it was set to true from the outside during unit tests. `#if DEBUG` was not an option, obviously.

I did further digging and noticed that if you run Thread.current.threadDictionary the thread running the XCTest contains the following key: com.apple.dt.xctest.waiter-manager

So I wrote this extension:

I opted to check for xctest alone and not the whole key to future proof it, from any possibile changes to the key.

So now the code looks like this:

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