types: avoid ts-expect-error on generateServiceProviderMetadata #510
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Description
In multiSamlStrategy, generateServiceProviderMetadata currently changes the signature from the base class, and uses a ts-expect-error so that compilation continues to work. However, the type files show errors because the subclass is no longer an instance of its base class.
This adds an overload to generateServiceProviderMetadata taking the original arguments and returning "never", while the implementation still checks the type of the callback to confirm we're using the right call.
Checklist: