Tables with default replica identity does not have old_table_row (is None) in UpdateEvent

# Bug report <!-- ⚠️ We receive a lot of bug reports which have already been solved or discussed. If you are looking for help, please try these first: - Docs: https://docs.supabase.com - Discussions: https://github.com/supabase/supabase/discussions - Discord: https://discord.supabase.com Before opening a bug report, please verify the following: --> - [x] I confirm this is a bug with Supabase, not with my own application. - [x] I confirm I have searched the [Docs](https://docs.supabase.com), GitHub [Discussions](https://github.com/supabase/supabase/discussions). ## Describe the bug If a table has full replica identity everything works as expected if I set default identity it works the way I expect nothign identity works - old_table_row is none in UpdateEvent. I've added logs in the write_events for `Event::Update` case to verify there is none, not in my following processing. ## To Reproduce Steps to reproduce the behavior, please provide code snippets or a repository: 1. ALTER TABLE ONLY {table} REPLICA IDENTITY DEFAULT 2. ALTER PUBLICATION {pub_name} ADD TABLE {table} 3. run replicator, see 5 for note 4. make a change in any row in the {table} 5. I've implemented my own replicator so I don't know how to observe it in etl-replicator ## Expected behavior UpdateEvent::old_table_row is Some ## Additional context DeleteEvent::old_table_row works as expected (is Some) if replica identity is default