Fix alert showing for unlimited schedules limit

What does this MR do and why?

Bug fix for alert showing for unlimited pipeline schedules limit.

The alert should only show when a user has access, does not have unlimited schedules and the limit has been reached.

MR acceptance checklist

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Screenshots or screen recordings

No access (guest user/reporter)

Unlimited schedules

Limit reached

How to set up and validate locally

1. Change planLimit in the query response to 0 , null and x
2. Test the different use-cases in Build > Pipeline schedules

Related to #442625 (closed)