Add port vend sensor mount to source control

The 3D model for this part currently lives on some computer in ACM and need to be tracked in this repo.

The issue does not name a file, format, or location beyond a 3D model on an ACM computer, and it is already assigned. Start by asking the maintainer or assignee where the port vend sensor mount model lives and where hardware models belong in the repo. Done means the correct model file is added to source control in the agreed location.

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