Introduce and link admin view to show all AKs by a given owner

• Create overview page
• Link in admin AKOwner list and in change view, showing the number of AKs by user
• This implements #207 (closed)

changed milestone to %KIF 52,0

added feature label

requested review from @ngeisler

added 11 commits

• 136e5117...b3a634fd - 10 commits from branch main
• 58f8d8fe - Introduce and link admin view to show all AKs by a given owner

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approved this merge request

merged

mentioned in commit 7b9a9bf5