[AC-1708] Teams Starter Plan (#3386)

* 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

* Added teams 2010 plan

* Reverted accidental change to StripePaymentService

* Split feature flag logic and added some explanatory comments

* Removed families changes

* Resolved issue where Teams Starter could not sign up for a new org with SM enabled

* Fixed issue with signing up for SM with Teams Starter

* Resolved issue where an active plan could increase their SM seat count to be greater than the base seats in the password manager plan

* Updated unit test to ensure Seats are higher than SmSeats

* Resolved issue where getting plans would return a value that LINQ previously cached when feature flag was in a different state

src/Admin/Views/Shared/_OrganizationFormScripts.cshtml

@@ -74,6 +74,7 @@
             case '@((byte)PlanType.TeamsAnnually2020)':
             case '@((byte)PlanType.TeamsMonthly)':
             case '@((byte)PlanType.TeamsAnnually)':
+            case '@((byte)PlanType.TeamsStarter)':
                 document.getElementById('@(nameof(Model.UsePolicies))').checked = false;
                 document.getElementById('@(nameof(Model.UseSso))').checked = false;
                 document.getElementById('@(nameof(Model.UseGroups))').checked = true;