Clean preexisting data using ImageStore

[mathemancer]

Fixes

Fixes #356 by @mathemancer

Description

This PR adds two new DAGs:

• One that systematically pulls all rows from the intermediary DB and runs them through the ImageStore (defined at src/cc_catalog_airflow/dags/cleaner_workflow.py), storing the resulting TSVs in a directory specific to cleaned, previously-ingested data, and
• Another that loads TSVs from that directory back into the intermediary DB, with a slightly modified logic to overwrite the old data.

Technical details

The main file hooking things together is at src/cc_catalog_airflow/dags/util/pg_cleaner.py.

Tests

There are numerous new tests covering the functionality. Also, one is welcome to set up the dockerized dev environment using the README, load some data into the local DB using the appropriate workflows, then turn on the two new workflows:

• postgres_image_cleaner
• tsv_to_postgres_loader_overwrite
  to see their effects.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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