Cleanup Harvesting Logic Repo

[rshewitt]

User Story

In order for the harvesting logic repo to only be a python module for the ETVL of dcatus catalogs, datagov wants to remove all files, functionalities, tests, and dependencies which don't involve the ETVL of a dcatus catalog.

Acceptance Criteria

• GIVEN the current harvesting logic repo #4925
  WHEN files, functionalities, tests, and dependencies not involving the ETVL of a dcatus catalog are removed
  THEN the repo will no longer contain these things.

Background

• datagov has expressed interest in replacing the current harvester with a workflow orchestration system ( e.g. airflow or windmill ) utilizing a python module for the ETVL of dcatus catalogs.
• One of the first steps in this effort was creating a harvesting logic repo containing general purpose logic for the ETVL of datasets we maintain. At the moment this repo focuses only on dcatus catalogs.
• Over time, the harvesting logic repo has become bloated with unneeded content ( e.g. postgres interfaces, a flask controller, an airflow implementation, s3 loading functionality, and docker services ).

Sketch

• remove everything related to the unneeded content mentioned in the background.

[rshewitt]

remove/commit things by component so they're easier to identify in the future and include those commits in the PR ( e.g. remove s3 help module, remove sqlachemy module, remove flask controller, etc... )