tasks/train_model.py uses deprecated SKLearn()

[EmielStoelinga]

In tasks/train_model.py SKLearn() is used while in fact this method to start an experiment is deprecated, see link. Afterwards, an environment as defined in the workspace or a curated environment can easily be used to train a model using the environment argument.

I would suggest to rewrite it to use a ScriptRunConfig object.

[wmeints]

There's a branch with the change for this. I included a bunch of other changes to remove anaconda from the template as we would like to work without that tool. I'll take a look and see if I can grab only the bits for the deprecation fix.