[PM-16684] Integrate Pricing Service behind FF (#5276)

* 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

src/Core/Billing/Extensions/BillingExtensions.cs

@@ -10,6 +10,17 @@ namespace Bit.Core.Billing.Extensions;
 
 public static class BillingExtensions
 {
+    public static ProductTierType GetProductTier(this PlanType planType)
+        => planType switch
+        {
+            PlanType.Custom or PlanType.Free => ProductTierType.Free,
+            PlanType.FamiliesAnnually or PlanType.FamiliesAnnually2019 => ProductTierType.Families,
+            PlanType.TeamsStarter or PlanType.TeamsStarter2023 => ProductTierType.TeamsStarter,
+            _ when planType.ToString().Contains("Teams") => ProductTierType.Teams,
+            _ when planType.ToString().Contains("Enterprise") => ProductTierType.Enterprise,
+            _ => throw new BillingException($"PlanType {planType} could not be matched to a ProductTierType")
+        };
+
     public static bool IsBillable(this Provider provider) =>
         provider is
         {