Check uniqueness of SCL Name when validating the field

[dlabordus]

As as engineer
I want to have faster feed back when a SCL Name is used
So that I can change it directly before saving/adding the SCL File

Background:
Issue com-pas/compas-scl-data-service#204 implements a Rest API Call to check if a name isn't already used.
This call can be used when saving a new SCL File to CoMPAS or updating the name in the CoMPAS Versions Editor.
When the name is already used block the action (Save/Update) and add a message to the Log Window using a LogEvent.

[github-actions]

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