Quaratine X.509 test with expired certificate

This test is currently failing due to an expired certificate being used
as a test fixture. Qurantining this test until we can figure out how to
generate new certificates.

spec/models/clusters/platforms/kubernetes_spec.rb

@@ -228,7 +228,7 @@ RSpec.describe Clusters::Platforms::Kubernetes do
               ca_pem: cert_chain)
       end
 
-      it 'includes chain of certificates' do
+      it 'includes chain of certificates', quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/347425' do
         cert1_file = File.read(Rails.root.join('spec/fixtures/clusters/root_certificate.pem'))
         cert1 = OpenSSL::X509::Certificate.new(cert1_file)