Add new LSF config option and update testing

A new LSF specific configuration (batch.lsf_job_cancellation) is added to limit the use of 'bkill' and job naming to this configuration only. The primary goal is to avoid the potential risk of conflicts with existing jobs that may rely on the "-J" argument. Future iterations may see this behavior become the default.

Additionally, a supporting internal package has been added that will eventually be used for all support batch executors. This will ideally help to avoid the duplication of generic mocks, especially in cases were integration testing is more relied upon.

Closes #147 (closed)