When a subscription has an active schedule during the ~15-day window before
renewal, the invoice preview for tax estimation was built with the new price
but without the Phase 2 discount coupon. This caused the estimated tax on the
subscription page to be higher than what Stripe would actually charge.
Pass the coupon ID from the schedule's Phase 2 discount through to
EstimatePremiumTaxAsync so it is included in the InvoiceCreatePreviewOptions.
* Implement the correct changes
* failing test has been removed
* Add unit testing and logs
* Resolve the pr comment on missed requirements
* fix the lint error
* resolve the build lint
* Fix the failing test
* Fix the failing test
* Add the IncompleteExpired status
* resolve the lint error
* Fix the build lint error
* Implement the IncompleteExpired flow
* test: add tests for legacy pricing pivot in GetBitwardenSubscriptionQuery
* feat(billing): preview next charge at new price for users on legacy Premium pricing
* chore: apply dotnet format
