* Renamed ProductType to ProductTierType
* Renamed Product properties to ProductTier
* Moved ProductTierType to Bit.Core.Billing.Enums namespace from Bit.Core.Enums
* Moved PlanType enum to Bit.Core.Billing.Enums
* Moved StaticStore to Bit.Core.Billing.Models.StaticStore namespace
* Added ProductType enum
* dotnet format
* Upgraded old 2019 plans to have the same features as 2020 and beyond
* Removed redundant test and moved additional test cases to GetByOrgIdAsync_SmNoneFreePlans_ReturnsNull
* Fixed issue where feature flag wasn't returning correct plans
* Resolved issue where getting plans would return a value that LINQ previously cached when feature flag was in a different state
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Co-authored-by: cyprain-okeke <108260115+cyprain-okeke@users.noreply.github.com>
