Structure_Engine: Update PileFoundation Geometry method

[peterjamesnugent]

Issues addressed by this PR

Closes #3411

Test files

https://burohappold.sharepoint.com/:u:/s/BHoM/EYbRjWNJQ3xDnepsnRTz1cQBaOOADL2wUdPn9FdauQ_ZOw?e=MqaFkK

Changelog

• Updated PileFoundation Geometry method to use IRegion Geometry method for the PileCap.

Additional comments

[peterjamesnugent]

@BHoMBot check required

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[peterjamesnugent]

@BHoMBot check copyright-compliance
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[bhombot-ci]

@peterjamesnugent to confirm, the following actions are now queued:

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[IsakNaslundBh]

Reviewed by code inspection and change makes sense. As bot is able to compile, I am happy for this to be merged.

[peterjamesnugent]

@BHoMBot check ready-to-merge

[bhombot-ci]

@peterjamesnugent to confirm, the following actions are now queued:

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