Dedupe labels in labels selector in Dashboard pages

Also moved useless helper methods and directly to the
DashboardController.

app/controllers/dashboard_controller.rb

@@ -21,17 +21,24 @@ class DashboardController < Dashboard::ApplicationController
   end
 
   def labels
+    labels = Label.where(project_id: @projects).select(:title, :color).uniq(:title)
+
     respond_to do |format|
       format.json do
-        render json: view_context.projects_labels_options
+        render json: labels
       end
     end
   end
 
   def milestones
+    milestones = Milestone.where(project_id: @projects).active
+    epoch = DateTime.parse('1970-01-01')
+    grouped_milestones = GlobalMilestone.build_collection(milestones)
+    grouped_milestones = grouped_milestones.sort_by { |x| x.due_date.nil? ? epoch : x.due_date }
+
     respond_to do |format|
       format.json do
-        render json: view_context.projects_milestones_options
+        render json: grouped_milestones
       end
     end
   end

app/helpers/labels_helper.rb

@@ -109,14 +109,6 @@ module LabelsHelper
     end
   end
 
-  def projects_labels_options
-    if @project
-      @project.labels
-    else
-      Label.where(project_id: @projects)
-    end
-  end
-
   def labels_filter_path
     if @project
       namespace_project_labels_path(@project.namespace, @project, :json)

app/helpers/milestones_helper.rb

@@ -46,19 +46,6 @@ module MilestonesHelper
     end
   end
 
-  def projects_milestones_options
-    milestones =
-      if @project
-        @project.milestones
-      else
-        Milestone.where(project_id: @projects)
-      end.active
-
-    epoch = DateTime.parse('1970-01-01')
-    grouped_milestones = GlobalMilestone.build_collection(milestones)
-    grouped_milestones.sort_by { |x| x.due_date.nil? ? epoch : x.due_date }
-  end
-
   def milestones_filter_dropdown_path
     if @project
       namespace_project_milestones_path(@project.namespace, @project, :json)