revert models groups.py and pagination.py

Author: bisgaard-itis

services/api-server/src/simcore_service_api_server/models/domain/groups.py

@@ -4,10 +4,10 @@
 class UsersGroup(BaseModel):
     gid: str
     label: str
-    description: str = None  # TODO: should be nullable
+    description: str | None = None
 
 
 class Groups(BaseModel):
     me: UsersGroup
-    organizations: list[UsersGroup] = []  # TODO: should be nullable
+    organizations: list[UsersGroup] | None = []
     all_: UsersGroup = Field(..., alias="all")

services/api-server/src/simcore_service_api_server/models/pagination.py

@@ -56,9 +56,7 @@ class OnePage(BaseModel, Generic[T]):
     """
 
     items: Sequence[T]
-    total: NonNegativeInt = Field(
-        default=None, validate_default=True
-    )  # TODO: should be nullable
+    total: NonNegativeInt | None = Field(default=None, validate_default=True)
 
     @field_validator("total", mode="before")
     @classmethod