feat(files_external): convert to delegated settings#59001

leftybournes merged 4 commits intonextcloud:masternextcloud/server:masterfrom

IONOS-Productivity:tkl/dev/files_external-delegation-rebased-on-NCIONOS-Productivity/ncw-server:tkl/dev/files_external-delegation-rebased-on-NCCopy head branch name to clipboard