See discussion at https://redhat-internal.slack.com/archives/C04KQHS01B5/p1726497455640869
There are no longer any SKUs that use syspurpose addons. Additionally, the addons command is being removed from subscription-manager in RHEL10. So we are free to remove addons from the Katello UI:
Activation key details
New activation key details
System Purpose card (host details)
1.
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[DEV] Remove syspurpose addons from Katello | New | Unassigned | ||
2.
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[QE] Remove syspurpose addons from Katello | New | Unassigned |