revert(BA-3696): Restore DeleteUserAction to main state

Revert DeleteUserAction and DeleteUserActionResult back to their
original main branch definitions (simple UserAction/BaseActionResult
base classes with email-only parameter).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: fregataa

src/ai/backend/manager/services/user/actions/delete_user.py

@@ -1,43 +1,27 @@
 from dataclasses import dataclass
 from typing import override
-from uuid import UUID
 
-from ai.backend.common.data.permission.types import RBACElementType
+from ai.backend.manager.actions.action import BaseActionResult
 from ai.backend.manager.actions.types import ActionOperationType
-from ai.backend.manager.data.permission.types import RBACElementRef
-from ai.backend.manager.services.user.actions.base import (
-    UserSingleEntityAction,
-    UserSingleEntityActionResult,
-)
+from ai.backend.manager.services.user.actions.base import UserAction
 
 
 @dataclass
-class DeleteUserAction(UserSingleEntityAction):
-    user_uuid: UUID
-    email: str  # Still needed for the service layer implementation
+class DeleteUserAction(UserAction):
+    email: str
+
+    @override
+    def entity_id(self) -> str | None:
+        return None
 
     @override
     @classmethod
     def operation_type(cls) -> ActionOperationType:
         return ActionOperationType.DELETE
 
-    @override
-    def target_entity_id(self) -> str:
-        return str(self.user_uuid)
-
-    @override
-    def target_element(self) -> RBACElementRef:
-        return RBACElementRef(RBACElementType.USER, str(self.user_uuid))
-
 
 @dataclass
-class DeleteUserActionResult(UserSingleEntityActionResult):
-    user_uuid: UUID
-
+class DeleteUserActionResult(BaseActionResult):
     @override
     def entity_id(self) -> str | None:
-        return str(self.user_uuid)
-
-    @override
-    def target_entity_id(self) -> str:
-        return str(self.user_uuid)
+        return None

src/ai/backend/manager/services/user/service.py

@@ -122,11 +122,10 @@ async def bulk_modify_users(self, action: BulkModifyUserAction) -> BulkModifyUse
         return BulkModifyUserActionResult(data=result)
 
     async def delete_user(self, action: DeleteUserAction) -> DeleteUserActionResult:
-        user_data = await self._user_repository.get_by_email_validated(email=action.email)
         await self._user_repository.soft_delete_user_validated(
             email=action.email,
         )
-        return DeleteUserActionResult(user_uuid=user_data.uuid)
+        return DeleteUserActionResult()
 
     async def get_user(self, action: GetUserAction) -> GetUserActionResult:
         """Retrieve a single user by UUID.