* feat(endpoint): send custom checkin interval * feat(endpoint): update edge checkin interval * feat(endpoint): save checkin interval * feat(endpoints): create endpoint with checkin interval * feat(endpoints): change tooltip * fix(edge-compute): fix typos Co-authored-by: Anthony Lapenna <anthony.lapenna@portainer.io> * fix(endpoints): show default interval * fix(endpoint): rename checkin property Co-authored-by: Anthony Lapenna <anthony.lapenna@portainer.io>