Same telegram handle

[nus-se-script]

Description: able to add same telegram handle

Expected: same telegram handle error message

Actual: same telegram handle accepted

Steps to reproduce:

• add n/john p/123 e/john@example.com s/123 tele/@royB

Suggestion: check if same telegram handle already exists

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_{[original: nus-cs2103-AY2324S1/pe-interim#560] [original labels: severity.Low type.FunctionalityBug]}

[cbj252]

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