fix workspace-member deletion with existing attachments/documents (#5232)

## Context
We have a non-nullable constraint on authorId in attachments and
documents, until we have soft-deletion we need to handle deletion of
workspace-members and their attachments/documents.
This PR introduces pre-hooks to deleteOne/deleteMany
This is called when a user deletes a workspace-member from the members
page

Next: needs to be done on user level as well. This is called when users
try to delete their own accounts. I've seen other issues such as
re-creating a user with a previously used email failing.

packages/twenty-server/src/engine/utils/global-exception-handler.util.ts

@@ -9,6 +9,7 @@ import {
   ValidationError,
   NotFoundError,
   ConflictError,
+  MethodNotAllowedError,
 } from 'src/engine/utils/graphql-errors.util';
 import { ExceptionHandlerService } from 'src/engine/integrations/exception-handler/exception-handler.service';
 
@@ -17,6 +18,7 @@ const graphQLPredefinedExceptions = {
   401: AuthenticationError,
   403: ForbiddenError,
   404: NotFoundError,
+  405: MethodNotAllowedError,
   409: ConflictError,
 };