SupportsShouldProcess doesn't care for WhatIfPreference

Summary of the new feature
It seems the SupportShouldProcess rule doesn't always pick up WhatIf being passed to a function later on. It mostly does this for external modules (that do it properly), but not when the functions are within the same module (different files) that I am actually building.

Proposed technical implementation details (optional)
I guess a prescan should be made and if there are commands with explicit WhatIf calls or WhatIfPreference calls it should treat it as condition to ignore.

Inizia riproducendo il comportamento di SupportsShouldProcess con WhatIfPreference passato tra funzioni nello stesso modulo, quindi esamina la regola SupportsShouldProcess e la sua gestione dei confini tra moduli. Il lavoro è completato quando l'uso esplicito di WhatIf o WhatIfPreference nelle funzioni dello stesso modulo viene riconosciuto in modo coerente, senza falsi positivi.