Revert "Restore Harvard Van Gogh image to primary fixture"

[marlo-longley]

Reverts #4173
This is broken again. It is keeping all other PRs from passing tests.
We should probably stop using this manifest, but the Van Gogh images are iconic to Mirador so we keep coming back...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.3%. Comparing base (ad08947) to head (1e068fe).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4221     +/-   ##
=======================================
+ Coverage   95.1%   95.3%   +0.2%     
=======================================
  Files        325     326      +1     
  Lines      16177   16200     +23     
  Branches    2546    2559     +13     
=======================================
+ Hits       15376   15423     +47     
+ Misses       796     772     -24     
  Partials       5       5             

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[enriquediaz]

Harvard reporting in. It's likely legit requests for manifests are getting caught in the net along with bot/non-human traffic once again. The story develops almost daily. I'm inquiring with our network operations team to learn more about what can be done here.

[marlo-longley]

@enriquediaz thanks! If after a while it's seeming difficult on your end, we can always revert and swap back.

[enriquediaz]

Approving and merging.