Remove KNotes from 24.08 release

[Albert Astals Cid]

Forwarding from https://invent.kde.org/sysadmin/release-tools/-/merge_requests/53


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The PIM team has agreed to stop maintaining (and releasing) the KNotes application,

we have a suitable migration path (Marknote has gained support to import notes), 

so we want to remove KNotes form 24.08 release and on.

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Cheers,
  Albert