[PM-18770] Convert Organization to Business Unit (#5610)

* [NO LOGIC] Rename MultiOrganizationEnterprise to BusinessUnit

* [Core] Add IMailService.SendBusinessUnitConversionInviteAsync

* [Core] Add BusinessUnitConverter

* [Admin] Add new permission

* [Admin] Add BusinessUnitConverterController

* [Admin] Add Convert to Business Unit button to Organization edit page

* [Api] Add OrganizationBillingController.SetupBusinessUnitAsync action

* [Multi] Propagate provider type to sync response

* [Multi] Put updates behind feature flag

* [Tests] BusinessUnitConverterTests

* Run dotnet format

* Fixing post-main merge compilation failure

src/Infrastructure.EntityFramework/AdminConsole/Repositories/Queries/ProviderUserProviderDetailsReadByUserIdStatusQuery.cs

@@ -35,6 +35,7 @@ public class ProviderUserProviderDetailsReadByUserIdStatusQuery : IQuery<Provide
             Permissions = x.pu.Permissions,
             UseEvents = x.p.UseEvents,
             ProviderStatus = x.p.Status,
+            ProviderType = x.p.Type
         });
     }
 }