teams: final teams.group.memberships removal

Fabio Maschirequested to merge
feat/final-teams-group-removal into main
  • create dedicated endpoint for fetching Primary PIs of team
  • remove group property from Team DTOs, as this should not be sent to FE

follow-up from !567 (merged)

BE of websites/root!1182 (merged)

Edited by Fabio Maschi

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