Remove the dead code and the associated worker

Adding changelog entry

app/workers/all_queues.yml

@@ -779,14 +779,6 @@
   :weight: 2
   :idempotent: 
   :tags: []
-- :name: notifications:new_release
-  :feature_category: :release_orchestration
-  :has_external_dependencies: 
-  :urgency: :low
-  :resource_boundary: :unknown
-  :weight: 2
-  :idempotent: 
-  :tags: []
 - :name: object_pool:object_pool_create
   :feature_category: :gitaly
   :has_external_dependencies: 

app/workers/new_release_worker.rb

-# frozen_string_literal: true
-
-# TODO: Worker can be removed in 13.2:
-# https://gitlab.com/gitlab-org/gitlab/-/issues/218231
-class NewReleaseWorker # rubocop:disable Scalability/IdempotentWorker
-  include ApplicationWorker
-
-  queue_namespace :notifications
-  feature_category :release_orchestration
-  weight 2
-
-  def perform(release_id)
-    release = Release.preloaded.find_by_id(release_id)
-    return unless release
-
-    NotificationService.new.send_new_release_notifications(release)
-  end
-end

changelogs/unreleased/rmv-worker-code.yml

+---
+title: Remove the unused worker code and its queue
+merge_request: 32595
+author: Ravishankar
+type: deprecated

config/sidekiq_queues.yml

@@ -166,8 +166,6 @@
   - 2
 - - new_note
   - 2
-- - notifications
-  - 2
 - - object_pool
   - 1
 - - object_storage

spec/workers/new_release_worker_spec.rb

-# frozen_string_literal: true
-
-# TODO: Worker can be removed in 13.2:
-# https://gitlab.com/gitlab-org/gitlab/-/issues/218231
-require 'spec_helper'
-
-RSpec.describe NewReleaseWorker do
-  let(:release) { create(:release) }
-
-  it 'sends a new release notification' do
-    expect_next_instance_of(NotificationService) do |instance|
-      expect(instance).to receive(:send_new_release_notifications).with(release)
-    end
-
-    described_class.new.perform(release.id)
-  end
-end