[Rebase] Warn users on possible risks on installing third party unvetted plugins

[RodoMa92]

Please tick as appropriate:

• [ ] I have tested this code on a steam deck or on a PC
• [x] My changes generate no new errors/warnings
• [ ] This is a bugfix/hotfix
• [x] This is a new feature

Description

This PR implements proper warning messages for third party install outside our store to warn users of potential malicious code outside our ecosystem.