Add reingestion workflow for Metropolitan

[stacimc]

Fixes

Fixes WordPress/openverse#1501 by @stacimc

Description

Adds a reingestion workflow for Metropolitan.

Notes

• For the configuration of reingestion days, I copied the configuration from Wikimedia. This is the existing configuration with the fewest number of nodes, so it feels like a reasonable first-attempt that can be reconfigured later.
• The Metropolitan API has an 80 request per second rate limit. Historically, most DagRuns complete very quickly (<30 minutes), with a few outliers at ~5hrs and ~9.5hrs. I've set the initial max_active_tasks to 2, which should respect the rate limit while giving the DAG better odds of succeeding within 24 hours.

Testing Instructions

There is an edge case in the ingestion limit logic which causes Metropolitan to ignore limits, so make sure you have #818 locally if you want to set a LIMIT. You can also manually 'succeed' pull data tasks to get the workflow to move quicker.

Make sure the metropolitan_museum_reingestion_workflow looks as expected. Run it locally with a very small INGESTION_LIMIT (I used 10).

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 a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated 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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[AetherUnbound]

This looks great! I love how easy it is to add a new reingestion workflow 😄

[obulat]

The addition process looks quite straightforward!