Automatic channel category sorting (#30866)

* Automatic channel category sorting

* Fix types

* AIed

* Fix issue where categories are updated for all users

* Move all logic to server, clean up

* PR feedback

* Fix lint

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/db/migrations/migrations.list

@@ -271,6 +271,8 @@ channels/db/migrations/mysql/000136_create_attribute_view.down.sql
 channels/db/migrations/mysql/000136_create_attribute_view.up.sql
 channels/db/migrations/mysql/000137_update_attribute_view.down.sql
 channels/db/migrations/mysql/000137_update_attribute_view.up.sql
+channels/db/migrations/mysql/000138_add_default_category_name_to_channel.down.sql
+channels/db/migrations/mysql/000138_add_default_category_name_to_channel.up.sql
 channels/db/migrations/postgres/000001_create_teams.down.sql
 channels/db/migrations/postgres/000001_create_teams.up.sql
 channels/db/migrations/postgres/000002_create_team_members.down.sql
@@ -543,3 +545,5 @@ channels/db/migrations/postgres/000136_create_attribute_view.down.sql
 channels/db/migrations/postgres/000136_create_attribute_view.up.sql
 channels/db/migrations/postgres/000137_update_attribute_view.down.sql
 channels/db/migrations/postgres/000137_update_attribute_view.up.sql
+channels/db/migrations/postgres/000138_add_default_category_name_to_channel.down.sql
+channels/db/migrations/postgres/000138_add_default_category_name_to_channel.up.sql