No possibility to use KopytkoFramework without a plugin to remove unit tests

[pawelhertman]

This is a Feature Proposal

Description

Currently, without a custom plugin to remove unit tests there is no possibility to use Kopytko Framework out-of-the-box. It is caused by having mocks in the official npm package (it's intended and fine) - mock files are trying to import from the @dazn/kopytko-unit-testing-framework package which I'm not using. So I need to write a plugin to remove any _mocks directories. I think a property of paths to exclude from the package per environment and per project would solve the problem (I recommend then to update README of the Framework to exclude mocks from non-test envs)