Update cluster fixtures with new cerificates

This test was previously quaratined because one of the fixtures was an
X.509 certificate which expired. This removes the quaratine and updates
the certificates to use the ones from about.gitlab.com which expire on
Nov 19 18:50:03 2022 GMT. This should be fine since these specs are
expected to be removed with 15.0 in (+- May 2022)

https://gitlab.com/groups/gitlab-org/configure/-/epics/8

spec/fixtures/clusters/ca_certificate.pem

------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----

spec/fixtures/clusters/intermediate_certificate.pem

 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

spec/fixtures/clusters/leaf_certificate.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

spec/fixtures/clusters/root_certificate.pem

 -----BEGIN CERTIFICATE-----
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+QQ4gOsC0p6Hpsk+QLjJg6VfLuQSSaGjlOCZgdbKfd/+RFO+uIEn8rUAVSNECMWEZ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 -----END CERTIFICATE-----

spec/models/clusters/platforms/kubernetes_spec.rb

@@ -201,7 +201,7 @@ RSpec.describe Clusters::Platforms::Kubernetes do
     it { is_expected.to be_an_instance_of(Gitlab::Kubernetes::KubeClient) }
 
     context 'ca_pem is a single certificate' do
-      let(:ca_pem) { File.read(Rails.root.join('spec/fixtures/clusters/ca_certificate.pem')) }
+      let(:ca_pem) { File.read(Rails.root.join('spec/fixtures/clusters/root_certificate.pem')) }
       let(:kubernetes) do
         build(:cluster_platform_kubernetes,
               :configured,
@@ -228,21 +228,22 @@ RSpec.describe Clusters::Platforms::Kubernetes do
               ca_pem: cert_chain)
       end
 
-      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)
-
-        cert2_file = File.read(Rails.root.join('spec/fixtures/clusters/intermediate_certificate.pem'))
-        cert2 = OpenSSL::X509::Certificate.new(cert2_file)
-
-        cert3_file = File.read(Rails.root.join('spec/fixtures/clusters/ca_certificate.pem'))
-        cert3 = OpenSSL::X509::Certificate.new(cert3_file)
+      where(:fixture_path) do
+        %w[
+          spec/fixtures/clusters/root_certificate.pem
+          spec/fixtures/clusters/intermediate_certificate.pem
+          spec/fixtures/clusters/leaf_certificate.pem
+        ]
+      end
 
-        cert_store = kubernetes.kubeclient.kubeclient_options[:ssl_options][:cert_store]
+      with_them do
+        it 'includes chain of certificates' do
+          cert_store = kubernetes.kubeclient.kubeclient_options[:ssl_options][:cert_store]
+          cert_file = File.read(Rails.root.join(fixture_path))
+          certificate = OpenSSL::X509::Certificate.new(cert_file)
 
-        expect(cert_store.verify(cert1)).to be true
-        expect(cert_store.verify(cert2)).to be true
-        expect(cert_store.verify(cert3)).to be true
+          expect(cert_store.verify(certificate)).to be true
+        end
       end
     end
   end