Remove obsolete rake tasks

These tasks dealt with data migrations or stats generations which were
done only once, so we don't need them anymore.

New CONSUL installations don't need these tasks, and existing CONSUL
installations will execute them when upgrading one release at a time.

lib/tasks/budgets.rake

@@ -13,22 +13,4 @@ namespace :budgets do
 
   end
 
-  namespace :phases do
-    desc "Generates Phases for existing Budgets without them & migrates description_* attributes"
-    task generate_missing: :environment do
-      Budget.where.not(id: Budget::Phase.all.pluck(:budget_id).uniq.compact).each do |budget|
-        Budget::Phase::PHASE_KINDS.each do |phase|
-          Budget::Phase.create(
-            budget: budget,
-            kind: phase,
-            description: budget.send("description_#{phase}"),
-            prev_phase: budget.phases&.last,
-            starts_at: budget.phases&.last&.ends_at || Date.current,
-            ends_at: (budget.phases&.last&.ends_at || Date.current) + 1.month
-          )
-        end
-      end
-    end
-  end
-
 end