Expose a flag to delete assets from VAST after upload

[bruno-f-cruz]

from @jtyoung84

"remove_source_folders": Task(skip_task=False)

Example:

upload_job_configs_v2 = UploadJobConfigsV2(
    job_type=job_type,
    project_name="Ephys Platform",
    platform=Platform.ECEPHYS,
    modalities=[Modality.ECEPHYS],
    subject_id="655019",
    acq_datetime=acq_datetime,
    tasks={
        "modality_transformation_settings": modality_transformation_settings,
        "gather_preliminary_metadata": gather_preliminary_metadata,
        "remove_source_folders": Task(skip_task=False)
    },
)

IT should be noted that this should already work out of the box by adding this information to clabe.yml. Nevertheless, the use-case seems general enough to just add this as something the class can do by the user instead.