Porting to the new Actions API

API changed in https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/813 and https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/823

Merge requests adapting to those changes:

• !3057 (merged)
• plasma-desktop!1600 (merged)
• kdeplasma-addons!425 (merged)
• kdeplasma-addons!430 (merged)
• kscreen!224 (merged)
• plasma-nm!262 (merged)
• plasma-pa!193 (merged)
• bluedevil!134 (merged)
• plasma-vault!32 (merged)