Log events from the import organization flow (#4632)

* Log events from the import organization flow

* Use an interface for the `OrganizationUser` object used to log events

* Log import events as being from the public api if they are

* Add logging for created groups

* Log proper group ids

* Fix tests

* Also log update events for groups

* Remove private API `import` endpoint

* Make `eventSystemUser` non-nullable for `ImportAsync`

* Fix tests

* Delete `ImportOrganizationUsersRequestModel`

* Fix tests

src/Core/AdminConsole/Enums/EventSystemUser.cs

@@ -3,5 +3,6 @@
 public enum EventSystemUser : byte
 {
     SCIM = 1,
-    DomainVerification = 2
+    DomainVerification = 2,
+    PublicApi = 3,
 }