Show CoMPAS Private elements in compare function

[dlabordus]

As a engineer
I also want to see what changed in the CoMPAS Private element
So that I know what changed in these elements during a compare.

Currently only know SCL Elements are compared when two versions from CoMPAS are compared.
All private elements are ignored. The reason is because it's unknown how to see if two privates are linked.
In the SCL for every element there is definition what attribute is used as the key so elements from two versions can be linked.
For CoMPAS privates this could be added, but for the current 2 privates this means linking them together on there tag name.
The 2 current privates can only occur one time in a SCL File, so the tag name can be used in this case.

[github-actions]

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