* Pm 19147 2 (#5544)
* Pm 19147 2 (#5544)
* Unit tests for tax strategies `GetUpdateOptions`
* Only allow automatic tax flag to be updated for complete subscription updates such as plan changes, not when upgrading additional storage, seats, etc
* unit tests for factory
* Fix build
* Automatic tax for tax estimation
* Fix stub
* Fix stub
* "customer.tax_ids" isn't expanded in some flows.
* Fix SubscriberServiceTests.cs
* BusinessUseAutomaticTaxStrategy > SetUpdateOptions tests
* Fix ProviderBillingServiceTests.cs
* Remove gRPC and convert PricingClient to HttpClient wrapper
* Add PlanType.GetProductTier extension
Many instances of StaticStore use are just to get the ProductTierType of a PlanType, but this can be derived from the PlanType itself without having to fetch the entire plan.
* Remove invocations of the StaticStore in non-Test code
* Deprecate StaticStore entry points
* Run dotnet format
* Matt's feedback
* Run dotnet format
* Rui's feedback
* Run dotnet format
* Replacements since approval
* Run dotnet format
* Getting the fresh invoice if the subscription was updated when validation the families sponsorship
* Getting fresh invoice after validation families sponsorship fails
* Also updating invoice line items
