Adding sleep cycle on invalid date that is 31 and below

[nus-se-script]

Adding a sleep cycle on a day that does not exist does not throw an error but instead adds a sleep cycle on the last valid date

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_{[original: nus-cs2113-AY2324S2/pe-interim#360] [original labels: type.FunctionalityBug severity.Medium]}

[OKW32]

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Duplicate status (if any):

Duplicate of #2563