Update Analytics swift API tests.

[tsunghung]

Update Analytics swift API tests. #no-changelog

[ncooke3]

Thanks for updating!

[tsunghung]

It seems that the @unknown default trick does not work for NS_TYPED_ENUM.

typedef NSString *FIRConsentType NS_TYPED_ENUM NS_SWIFT_NAME(ConsentType);
extern FIRConsentType const FIRConsentTypeAdStorage;
extern FIRConsentType const FIRConsentTypeAnalyticsStorage;
extern FIRConsentType const FIRConsentTypeAdUserData;
extern FIRConsentType const FIRConsentTypeAdPersonalization;

The fix is to remove @unknown, which would not require listing all enumerations. It makes the whole switch statement less useful. (I already list whole known enumerations in the setConsent() test.)