Merge branch '233994_inherit_designs_counter_from_base_counter' into 'master'

Inherit `DesignsCounter` from `BaseCounter`

See merge request gitlab-org/gitlab!47389

lib/gitlab/usage_data_counters/designs_counter.rb

 # frozen_string_literal: true
 
 module Gitlab::UsageDataCounters
-  class DesignsCounter
-    extend Gitlab::UsageDataCounters::RedisCounter
-
+  class DesignsCounter < BaseCounter
     KNOWN_EVENTS = %w[create update delete].freeze
-
-    UnknownEvent = Class.new(StandardError)
-
-    class << self
-      # Each event gets a unique Redis key
-      def redis_key(event)
-        raise UnknownEvent, event unless KNOWN_EVENTS.include?(event.to_s)
-
-        "USAGE_DESIGN_MANAGEMENT_DESIGNS_#{event}".upcase
-      end
-
-      def count(event)
-        increment(redis_key(event))
-      end
-
-      def read(event)
-        total_count(redis_key(event))
-      end
-
-      def totals
-        KNOWN_EVENTS.map { |event| [counter_key(event), read(event)] }.to_h
-      end
-
-      def fallback_totals
-        KNOWN_EVENTS.map { |event| [counter_key(event), -1] }.to_h
-      end
-
-      private
-
-      def counter_key(event)
-        "design_management_designs_#{event}".to_sym
-      end
-    end
+    PREFIX = 'design_management_designs'
   end
 end