* Add HasConfirmedOwnersExceptQuery class, interface and unit tests
* Register IHasConfirmedOwnersExceptQuery for dependency injection
* Replace OrganizationService.HasConfirmedOwnersExceptAsync with HasConfirmedOwnersExceptQuery
* Refactor DeleteManagedOrganizationUserAccountCommand to use IHasConfirmedOwnersExceptQuery
* Fix unit tests
* Extract IOrganizationService.RemoveUserAsync into IRemoveOrganizationUserCommand; Update unit tests
* Extract IOrganizationService.RemoveUsersAsync into IRemoveOrganizationUserCommand; Update unit tests
* Refactor RemoveUserAsync(Guid organizationId, Guid userId) to use ValidateDeleteUser
* Refactor RemoveOrganizationUserCommandTests to use more descriptive method names
* Refactor controller actions to accept Guid directly instead of parsing strings
* Add unit tests for removing OrganizationUser by UserId
* Refactor remove OrganizationUser by UserId method
* Add summary to IHasConfirmedOwnersExceptQuery
