Add option to remove objects with validation problems

[Erik-Geo]

While working on one of the examples in a Jupyter Notebook, I notice that after every selection operation (that causes the validation to re-run on the new selection) I get some validation warnings over and over again. I will remove those objects manually for now, but it would be nice to have the option to remove unvalidated objects in-place with e.g. a method 'remove_invalid_objects'