This commit implements the frontend of migrating the
`allow_edit_history` setting to `message_edit_history_visibility`.
This allows organizations, to have an intermediate setting to
view only the "Moves" history of the messages.
Fixes#21398.
Co-authored-by: Shlok Patel <shlokcpatel2001@gmail.com>
Co-authored-by: Tim Abbott <tabbott@zulip.com>