Fix CLI status when waiting for completion

After completion, the CLI node should be Completed and not Completing.
Merge branch 'workflow-cancel-cli-fix' into workflow

* workflow-cancel-cli-fix:
  Fix CLI status when waiting for completion
Integrate Skin Model Maker in workflow

To facilitate the use of the skin model maker, the CreateSkinModel function
is taken out of the SkinModelMakerWidget. The previous skin maker
(a simple grayscale model maker) is replaced by a call to the skin model
maker CreateSkinModel function.

See Issue #14026