valid task schedule fails validation on the last day of the month

[gulducat]

Time based task execution (the new enterprise schedule{} block) will fail on the last day of the month due to an incorrect day-of-the-month comparison: https://github.com/hashicorp/nomad/blob/v1.8.0/nomad/structs/task_sched.go#L145

[github-actions]

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