sagemathgh-40044: Remove Pipfiles
    
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A couple of Pipfile's were added by mistake in the branch of sagemath#39783.
They are removed here.

### 📝 Checklist

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preview.

### ⌛ Dependencies

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URL: sagemath#40044
Reported by: Enrique Manuel Artal Bartolo
Reviewer(s): Dima Pasechnik

Author: Release Manager