Delete volumetric_density and gravimetric_density nodes in acXML

Description

In order to streamline energy densities to one position (acXML or lib), we agreed on deleting it from the acXML and create a new lib to access them. Therefore they are deleted here to eliminate doubleing

Related Issue(s)

Testing Instructions

See MR in libs.

Developer Checklist

  • Code has been tested locally and/or in pipeline.

Merge request reports

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