DEV: Remove badge_granted_title column from user_profiles (#20476)

That column is obsolete since we added the `granted_title_badge_id` column in 2019 (56d3e29a698e704f647cf2e500d0d94d7d9e21bf). Having both columns can lead to inconsistencies (mostly due to old data from before 2019).

For example, `BadgeGranter.revoke_ungranted_titles!` doesn't work correctly if `badge_granted_title` is `false` while `granted_title_badge_id` points to the badge that is used as title.

db/post_migrate/20230228105851_drop_badge_granted_title_column.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class DropBadgeGrantedTitleColumn < ActiveRecord::Migration[7.0]
+  DROPPED_COLUMNS ||= { user_profiles: %i[badge_granted_title] }
+
+  def up
+    DROPPED_COLUMNS.each { |table, columns| Migration::ColumnDropper.execute_drop(table, columns) }
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end