Move moderator_note to LoS

[luisa-beerboom]

Closes #2592
Needs OpenSlides/openslides-meta#162

TODO:

• migration!
• fix agenda_item.update test

[m-schieder]

[backendmanage] ERROR:openslides_backend.shared.handlers.base_handler:'NoneType' object is not iterable
[backendmanage] Traceback (most recent call last):
[backendmanage] File "/app/openslides_backend/migrations/migration_handler.py", line 102, in execute_migrate_command
[backendmanage] return handler.execute_command(command)
[backendmanage] File "/app/openslides_backend/migrations/migration_wrapper.py", line 76, in execute_command
[backendmanage] self.handler.finalize()
[backendmanage] File "/usr/local/lib/python3.10/site-packages/datastore/migrations/core/migration_handler.py", line 291, in finalize
[backendmanage] self.model_migrater.migrate()
[backendmanage] File "/usr/local/lib/python3.10/site-packages/datastore/migrations/core/migraters/model_migrater.py", line 29, in migrate
[backendmanage] events = migration.migrate(self.reader)
[backendmanage] File "/usr/local/lib/python3.10/site-packages/datastore/migrations/core/base_migrations/base_model_migration.py", line 16, in migrate
[backendmanage] return self.migrate_models()
[backendmanage] File "/app/openslides_backend/migrations/migrations/0056_move_moderator_notes.py", line 66, in migrate_models
[backendmanage] [
[backendmanage] File "/app/openslides_backend/migrations/migrations/0056_move_moderator_notes.py", line 97, in
[backendmanage] perm_substrings := [
[backendmanage] File "/app/openslides_backend/migrations/migrations/0056_move_moderator_notes.py", line 103, in
[backendmanage] if any(
[backendmanage] TypeError: 'NoneType' object is not iterable