db/migrations: drop nextsyncat and description columns from shared remotes (#25064)

server/channels/db/migrations/postgres/000114_sharedchannelremotes_drop_nextsyncat_description.down.sql

@@ -0,0 +1 @@
+-- It is intentionally to not have rollback for sharedchannelremotes_drop_nextsyncat_description

server/channels/db/migrations/postgres/000114_sharedchannelremotes_drop_nextsyncat_description.up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE sharedchannelremotes DROP COLUMN IF EXISTS nextsyncat;
+ALTER TABLE sharedchannelremotes DROP COLUMN IF EXISTS description;