Move ee/lib/gitlab/ci/reports/security POROs to CE

relates to https://gitlab.com/gitlab-org/gitlab/-/issues/284689

ee/spec/lib/gitlab/ci/reports/security/identifier_spec.rb → spec/lib/gitlab/ci/reports/security/identifier_spec.rb

@@ -6,7 +6,8 @@ RSpec.describe Gitlab::Ci::Reports::Security::Identifier do
   using RSpec::Parameterized::TableSyntax
 
   describe '#initialize' do
-    subject { described_class.new(**params) }
+    # wrote the class explicitly because described_class kept returning Gitlab::identifier<module>
+    subject { Gitlab::Ci::Reports::Security::Identifier.new(**params) }
 
     let(:params) do
       {