[Gaprindashvili]move #my_zone from ArchivedMixin to OldEmsMixin #17540
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Not every model that needs
ArchivedMixin
has#ext_management_system
or#old_ext_management_sytem
. For those do need to use#old_ext_management_system
now they should includeOldEmsMixin
.This is a followup PR of #17481
Fixes issue #17535