Feat: check if system has creds saved, add new messages, extend backendSystem#3720

mikicvi-SAP wants to merge 4 commits intomainSAP/open-ux-tools:mainfrom

feat/3718/prevent-overwriting-saved-system-without-credentialsSAP/open-ux-tools:feat/3718/prevent-overwriting-saved-system-without-credentialsCopy head branch name to clipboard