Replace RCPurchasesErrorCodeDomain with ErrorCode.errorDomain in tests
#5924
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Motivation
Sometimes we get compilation errors in the tests targets like these:

The reason is that the
RCPurchasesErrorCodeDomainsymbol is not explicitly declared in the SDK. It's the Objective-C bridge ofErrorCode.errorDomainand is declared in the auto-generatedRevenueCat-Swift.hfile:But this
RevenueCat-Swift.hfile doesn't always necessarily exist.In particular, I got this error when adding the RevenueCat dependency to Unit Tests as a Swift Package using Tuist when working on #5888.
Description
This PR replaces the uses of
RCPurchasesErrorCodeDomainin tests with its Swift equivalent:ErrorCode.errorDomain, which is always defined.