Default unfurling of links and media to False in Slack notifications

[stacimc]

Fixes

Description

Recent provider DAG errors have caused notifications containing images to be sent to Slack. @sarayourfriend pointed out that while these messages have historically been harmless, it's possible that this could happen with NSFW content.

This PR updates our Catalog Slack utility to not unfurl links or media by default.

Testing Instructions

Go through the current uses of send_message and send_alert and verify that there are no use cases where we definitely want media and/or links to be unfurled.

For further manual testing, I'm not sure how to force a Slack message with an image 🤔

Checklist

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• 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]

I can't imagine wanting to have links unfurled for any of our current use cases. Thanks for doing this! We should also have another PR for the ingestion server to disable it there too 💯

[stacimc]

Agreed! I opened WordPress/openverse-api#954 in the API to track that -- should be an extremely quick one. I'm planning on grabbing it tomorrow if no one else does :)

[sarayourfriend]

🚀