Update the application to use the partitioned table p_ci_pipelines

See https://docs.gitlab.com/ee/development/database/partitioning/list.html#step-10---update-the-application-to-use-the-partitioned-table

• To change the table_name for Ci::Pipeline, use a change management issue

• NOTE that we will need to update the enum Enums::InternalId.usage_resources:

  module Enums
    module InternalId
      def self.usage_resources
        {
          # from: ci_pipelines: 5,
          p_ci_pipelines: 5,
        }
      end
    end
  end
  

• And define the internal_id_scope_usage as :p_ci_pipelines as well:

  module Ci
    class Pipeline < Ci::ApplicationRecord
      def self.internal_id_scope_usage; :p_ci_pipelines; end
    end
  end