Set low custom apdex for Value Stream Analytics

Value Stream Analytics is a data-intensive feature that users do not
expect to load as quickly as other resources. This sets a custom
apdex SLI urgency of "low" to allow for the feature's historically
relatively slower load times.

app/controllers/projects/analytics/cycle_analytics/stages_controller.rb

@@ -11,6 +11,8 @@ class Projects::Analytics::CycleAnalytics::StagesController < Projects::Applicat
   before_action :authorize_read_cycle_analytics!
   before_action :only_default_value_stream_is_allowed!
 
+  urgency :low
+
   private
 
   override :parent

app/controllers/projects/analytics/cycle_analytics/summary_controller.rb

@@ -9,6 +9,8 @@ class Projects::Analytics::CycleAnalytics::SummaryController < Projects::Applica
 
   before_action :authorize_read_cycle_analytics!
 
+  urgency :low
+
   def show
     render json: project_level.summary
   end

ee/app/controllers/groups/analytics/cycle_analytics/stages_controller.rb

@@ -11,6 +11,8 @@ module Groups
         before_action :validate_params, only: %i[median average records average_duration_chart count]
         before_action :authorize_read_group_stage, only: %i[median average records average_duration_chart count]
 
+        urgency :low
+
         override :index
         def index
           return render_403 unless can?(current_user, :read_group_cycle_analytics, @group)

ee/app/controllers/groups/analytics/cycle_analytics/summary_controller.rb

@@ -11,6 +11,8 @@ module Groups
         before_action :authorize_access
         before_action :validate_params
 
+        urgency :low
+
         def show
           render json: group_level.summary
         end