Support both external-dns TXT record formats
This is just to show what I meant with https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/1173#note_6617297
okd4-install MR: https://gitlab.cern.ch/paas-tools/okd4-install/-/merge_requests/1183
Closes https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/1173