Update deprecation notice for self-managed decomposition to 18.0
What does this MR do and why?
This MR updates the target to make self-managed decomposition mandatory from 17.0 to 18.0. This is partly because we would like to receive more feedback from customers on Beta first, as we are currently not confident some of them would not run into problems in case they have specific configurations.
This decision also mitigates that grouptenant scale has to focus on Cells and the Organization at the moment, and postponing the GA release for the self-managed decomposition will help in these endeavours.
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