Alan Guo Xiang Tan 26dfb8a489
DEV: Remove chat related migration (#23449)
What motivated this change?

A core migration contains chat related code and this should not be the
case since chat related migration code should live in the chat plugin.

What does this change do?

This change removes the migration which was introduced to keep existing
sites on the legacy navigation menu as well as keep chat disabled when
the defaults for the `navigation_menu` and `chat_enabled` site settings
were flipped. Since this migration doesn't apply to new sites and
the migration has already been introduced for 9 months, it is safe for
us to remove it.
2023-09-08 12:41:56 +08:00
..