Remove EE::Gitlab::Verify::JobArtifacts since it's not needed anymore

Signed-off-by: Rémy Coutable <remy@rymai.me>

ee/lib/ee/gitlab/verify/job_artifacts.rb

-module EE
-  module Gitlab
-    module Verify
-      module JobArtifacts
-        extend ::Gitlab::Utils::Override
-
-        private
-
-        override :all_relation
-        def all_relation
-          super.with_files_stored_locally
-        end
-      end
-    end
-  end
-end

ee/spec/lib/ee/gitlab/verify/job_artifacts_spec.rb

-require 'spec_helper'
-
-describe Gitlab::Verify::JobArtifacts do
-  before do
-    stub_artifacts_object_storage
-  end
-
-  it 'includes CI job artifacts in object storage' do
-    local_failure = create(:ci_job_artifact)
-    remote_failure = create(:ci_job_artifact, :remote_store)
-
-    failures = {}
-    described_class.new(batch_size: 10).run_batches { |_, failed| failures.merge!(failed) }
-
-    expect(failures.keys).to contain_exactly(local_failure, remote_failure)
-  end
-end

lib/gitlab/verify/job_artifacts.rb

 module Gitlab
   module Verify
     class JobArtifacts < BatchVerifier
-      prepend ::EE::Gitlab::Verify::JobArtifacts
-
       def name
         'Job artifacts'
       end