refactor(access): Rename model Organization -> Tenant

ref: #756 #505

app/settings/tests/functional/user_settings/test_user_settings_viewset.py

@@ -7,7 +7,7 @@ from django.shortcuts import reverse
 from django.test import Client, TestCase
 from django import urls
 
-from access.models.organization import Organization
+from access.models.tenant import Tenant as Organization
 from access.models.team import Team
 from access.models.team_user import TeamUsers