Update Enki non-DRM to use RedirectFulfillment

[jonathangreen]

Description

In #2035 I noticed that we appear to be streaming full Enki ebooks though the CM, which isn't ideal. This updates to use a redirect fulfillment.

🚨 From what I see this should work, but I need to find a way to do a real world test on this. Going to leave this in draft until I figure that bit out.

Edit: I did some testing with this, it does look like we are currently proxying these titles though the CM. Its not a huge number of titles, but we are better off using a redirect for them. All the local testing I can do says this should work, but can't fully test until its deployed somewhere and we can pull in a title with the mobile app.

I think this one can get merged, and we'll do some testing on minotaur then roll back if we need to.

I was testing with the title: "All I Really Need to Know I Learned from KISS" by Chris Epting.

Motivation and Context

Looks like this code came in way back as part of this PR: NYPL-Simplified/circulation#717. Looks like it was a band-aid fix that lasted ~7 years, so pretty good bandaid actually 😆.

How Has This Been Tested?

• Added unit test
• Tested that previously the CM acted as a proxy
• Tested that after this change, the CM serves a redirect link
  • Tested that I can access that redirect link
  • This should be fine for the apps, this is how other content works

Checklist

• I have updated the documentation accordingly.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.76%. Comparing base (69f6e3e) to head (001a0ea).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2036   +/-   ##
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  Coverage   90.76%   90.76%           
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  Files         342      342           
  Lines       40512    40511    -1     
  Branches     8770     8770           
=======================================
+ Hits        36769    36770    +1     
+ Misses       2486     2485    -1     
+ Partials     1257     1256    -1     

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[tdilauro]

Looks good! 🚀