[notifications] use non-fixed message-id for EntityUpdatedNotificationView More than one of those can be sent for a given entity, so they shouldn't all have the same message-id. Closes #4962712.

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−from os.path import join
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−assert __file__.endswith(join('scripts', 'script1.py')), __file__
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−assert '__main__' == __name__, __name__
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−assert [] == __args__, __args__