Refactoring of #32211
this move the PublicOnly() filter calcuation next to the DB querys and
let it be decided by the Doer
---
*Sponsored by Kithara Software GmbH*
(cherry picked from commit 43c252dfeaf9ab03c4db3e7ac5169bc0d69901ac)
Conflicts:
models/organization/org_test.go
models/organization/org_user_test.go
routers/web/org/home.go
rather simple conflict resolution but not trivial
tests/integration/user_count_test.go had to be adapted (simple)
because it does not exist in Gitea and uses the modified model
