Refactor WordPress to use ProviderDataIngester

[AetherUnbound]

Fixes

Fixes WordPress/openverse#1508 by @stacimc

Description

This PR refactors the WordPress Photo Directory provider script to use the ProviderDataIngester class. Since this was one of our more recent provider additions, it was already fairly closely aligned with our general layout now! I removed all of the boilerplate functions the class now handles, and most of the remaining functions did not need significant updates.

Testing Instructions

1. just test
2. Run the workflow locally and ensure that data gets inserted into the catalog.

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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[stacimc]

Looks great! Tested locally and everything is good 👍 Plus it's nice to see so much cleanup around the delayed requester 😄

Other than a quick comment about required field's and @obulat's suggestion to remove the filetype, I think this is good to go!

[AetherUnbound]

@obulat @stacimc removed the filetype extraction and addressed other feedback, this should be ready for another review!

[stacimc]

🥳

[sarayourfriend]

Nice! Just one note but totally not a blocker 🏎️