* Add feature flag
* Disable provider and schedule cancellation when subscription goes unpaid
* Run dotnet format
* Only set provider subscription cancel_at when subscription is going from paid to unpaid
* Update tests
* 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
* Add command interface and implementation for disabling organizations
* Register organization disable command for dependency injection
* Add unit tests for OrganizationDisableCommand
* Refactor subscription handlers to use IOrganizationDisableCommand for disabling organizations
* Remove DisableAsync method from IOrganizationService and its implementation in OrganizationService
* Remove IOrganizationService dependency from SubscriptionDeletedHandler
* Remove commented TODO for sending email to owners in OrganizationDisableCommand
* Add organization enable command implementation
* Add unit tests for OrganizationEnableCommand
* Add organization enable command registration for dependency injection
* Refactor payment and subscription handlers to use IOrganizationEnableCommand for organization enabling
* Remove EnableAsync methods from IOrganizationService and OrganizationService
* Add xmldoc to IOrganizationEnableCommand
* Refactor OrganizationEnableCommand to consolidate enable logic and add optional expiration
* chore: set up a `CODEOWNERS` space for platform
* chore: move sql objects for `Installation` to platform's domain
* chore: move `Installation` and `PushRelay` code to platform's domain
