fix(invoice-preview): Support preview for subscription during upgrade or downgrade #3744
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Context
Current logic for invoice preview does not take into account if existing subscription is in the process of downgrade or upgrade. To generate proper invoice preview we need to slightly adjust data so that subscription state matches one of a new bill run.
Description
Add validation for customer persistence. It improves UX by providing more precise error message for some invalid params.
Add support for proper preview of subscription in a process of being downgraded.