Onboarding progress updates should not raise on failure

  fixes https://gitlab.com/gitlab-org/gitlab/-/issues/456535

app/models/onboarding/progress.rb

@@ -76,7 +76,7 @@ def register(namespace, actions)
         return if nil_actions.empty?
 
         updates = nil_actions.inject({}) { |sum, action| sum.merge!({ column_name(action) => now }) }
-        onboarding_progress.update!(updates)
+        onboarding_progress.update(updates)
       end
 
       def completed?(namespace, action)