Merge branch 'pb-remove-gitlab-sidekiqlogger' into 'master'

Remove unused SidekiqLogger

See merge request gitlab-org/gitlab!39081

lib/gitlab/sidekiq_logger.rb

-# frozen_string_literal: true
-
-module Gitlab
-  class SidekiqLogger < Gitlab::Logger
-    def self.file_name_noext
-      'sidekiq'
-    end
-  end
-end