🚚(exceptions) move invitation-related exception to core

move invitation-related from mailbox_manager to core, as
it will be useful for teams too

src/backend/core/models.py

@@ -32,12 +32,11 @@ from timezone_field import TimeZoneField
 from treebeard.mp_tree import MP_Node, MP_NodeManager
 
 from core.enums import WebhookProtocolChoices, WebhookStatusChoices
+from core.exceptions import EmailAlreadyKnownException
 from core.plugins.registry import registry as plugin_hooks_registry
 from core.utils.webhooks import webhooks_synchronizer
 from core.validators import get_field_validators_from_setting
 
-from core.exceptions import EmailAlreadyKnownException
-
 logger = getLogger(__name__)
 
 current_dir = os.path.dirname(os.path.abspath(__file__))
@@ -1006,8 +1005,6 @@ class BaseInvitation(BaseModel):
         self.clean()
         self.updated_at = timezone.now()
 
-        
-
     @property
     def is_expired(self):
         """Calculate if invitation is still valid or has expired."""

src/backend/core/tests/test_models_invitations.py

@@ -16,8 +16,7 @@ from faker import Faker
 from freezegun import freeze_time
 
 from core import factories, models
-
-from mailbox_manager.exceptions import EmailAlreadyKnownException
+from core.exceptions import EmailAlreadyKnownException
 
 pytestmark = pytest.mark.django_db
 

src/backend/mailbox_manager/api/client/viewsets.py

@@ -10,11 +10,11 @@ from rest_framework.response import Response
 
 from core import models as core_models
 from core.api.client.serializers import UserSerializer
+from core.exceptions import EmailAlreadyKnownException
 
 from mailbox_manager import enums, models
 from mailbox_manager.api import permissions
 from mailbox_manager.api.client import serializers
-from mailbox_manager.exceptions import EmailAlreadyKnownException
 from mailbox_manager.utils.dimail import DimailAPIClient
 
 

src/backend/mailbox_manager/models.py

@@ -17,8 +17,8 @@ from django.utils.text import slugify
 from django.utils.translation import get_language, gettext, override
 from django.utils.translation import gettext_lazy as _
 
-from core.models import BaseInvitation, BaseModel, Organization, User
 from core.exceptions import EmailAlreadyKnownException
+from core.models import BaseInvitation, BaseModel, Organization, User
 
 from mailbox_manager.enums import (
     MailboxStatusChoices,