Have storage alerts last for 30 days

Since users can hit a cap, 75% usage for example, the alert
needs to be refreshed periodically.
However we don't want to overfire these alerts either.

ee/app/assets/javascripts/namespace_storage_limit_alert.js

@@ -5,7 +5,7 @@ const handleOnDismiss = ({ currentTarget }) => {
     dataset: { id, level },
   } = currentTarget;
 
-  Cookies.set(`hide_storage_limit_alert_${id}_${level}`, true, { expires: 365 });
+  Cookies.set(`hide_storage_limit_alert_${id}_${level}`, true, { expires: 30 });
 
   const notification = document.querySelector('.js-namespace-storage-alert');
   notification.parentNode.removeChild(notification);

ee/spec/frontend/namespace_storage_limit_alert_spec.js

@@ -30,7 +30,7 @@ describe('broadcast message on dismiss', () => {
     dismiss();
 
     expect(Cookies.set).toHaveBeenCalledWith('hide_storage_limit_alert_1_info', true, {
-      expires: 365,
+      expires: 30,
     });
   });
 });