Add Milestone tag select filter on executions public page

app/controllers/budgets/executions_controller.rb

@@ -12,15 +12,15 @@ module Budgets
 
     private
       def investments_by_heading
+        base = @budget.investments.winners
+        base = base.joins(milestones: :translations).includes(:milestones)
+        base = base.tagged_with(params[:milestone_tag]) if params[:milestone_tag].present?
+
         if params[:status].present?
-          @budget.investments.winners
-                  .with_milestone_status_id(params[:status])
-                  .uniq
-                  .group_by(&:heading)
+          base = base.with_milestone_status_id(params[:status])
+          base.uniq.group_by(&:heading)
         else
-          @budget.investments.winners
-                  .joins(milestones: :translations)
-                  .distinct.group_by(&:heading)
+          base.distinct.group_by(&:heading)
         end
       end