Remove unused E2EE messaging code (#31193)

spec/workers/push_encrypted_message_worker_spec.rb

@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe PushEncryptedMessageWorker do
-  let(:worker) { described_class.new }
-
-  describe 'perform' do
-    it 'runs without error for missing record' do
-      expect { worker.perform(nil) }.to_not raise_error
-    end
-  end
-end