Task name duplication not being checked properly - should be case insensitive

[nus-pe-bot]

Expected

Two tasks with the same name - irrespective of their casing should be considered the same task (or at least a warning should be given to the user)

Actual

The name equality is case-sensitive to Grade Mission 1 is considered different from grade mission 1 - which might lead to "duplicate" tasks (based on the problem domina) in the same list

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_{[original: nus-cs2103-AY2223S1/pe-interim#5619] [original labels: type.FunctionalityBug severity.Low]}

[tensaida]

Team's Response

this behaviour of the app does not violate anything in the user guide, so it is not a functionality bug. moreover, our team does not believe task names should be case in-sensitive.

Duplicate status (if any):

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