Benefits: Better dashboard status for benefits requiring user action

[birkjernstrom]

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GitHub and Discord benefits require customer to connect their accounts in order to be fulfilled and properly granted.

Until then, they are considered revoked with an error of type BenefitActionRequiredError. However, we should clarify this in the dashboard so merchants are not confused and think it's truly revoked as in the customer not having access to it.

Instead showing it as "User action required" as a status for instance.