Add Katmai NPS source from Flickr

[sarayourfriend]

Fixes

Part of #4856 by @sarayourfriend

Description

This PR adds Katmai National Park Service as a flickr-based source. https://www.flickr.com/photos/99350217@N03

I will kick off a batched update to backfill existing works from Katmai with the new source string.

Testing Instructions

Confirm I have the creator ID correct, I don't think there's anything else to test, though you can run Flickr ingestion locally with these "additional query params" and check that source is set to katmai_nps:

{
        "max_upload_date": 1701349200,
        "min_upload_date": 1690812000,
        "user_id": "99350217@N03"
}

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  for the catalog or ov just api/generate-docs for the API) where applicable.

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[zackkrida]

LGTM!

Don't forget that before these images go live katmai_nps will need to be added as a "Content source" in the Django admin UI.

[sarayourfriend]

Yep! I almost went ahead and added it in production before, but was worried about it appearing in the stats list with 0 images. I wonder if we could filter those, at least in the frontend sources page, so that we can "preload" sources before they have any data available?