Add rails logger to debug EKS errors

Just rescuing the error and responding with 422 unprocessable entity
makes debugging AWS authentication errors difficult, so add a Rails
logger so the specific error message shows up in the dev logs

app/services/clusters/aws/authorize_role_service.rb

@@ -23,7 +23,9 @@ module Clusters
         @role = create_or_update_role!
 
         Response.new(:ok, credentials)
-      rescue *ERRORS
+      rescue *ERRORS => e
+        Gitlab::ErrorTracking.track_exception(e)
+
         Response.new(:unprocessable_entity, {})
       end
 

spec/services/clusters/aws/authorize_role_service_spec.rb

@@ -53,6 +53,12 @@ RSpec.describe Clusters::Aws::AuthorizeRoleService do
         expect(subject.status).to eq(:unprocessable_entity)
         expect(subject.body).to eq({})
       end
+
+      it 'logs the error' do
+        expect(::Gitlab::ErrorTracking).to receive(:track_exception)
+
+        subject
+      end
     end
 
     context 'cannot create role' do