feat: unmask exceptions on blob retrieve error

[jennifer-richards]

These have not been encountered in at least three months, likely longer.

Still remains to unmask exceptions when storing blobs. We are probably ready to do that, but log noise caused by expected failures makes it hard to be certain. Soon...

Originally proposed in #10692

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.46%. Comparing base (68104b5) to head (98983b5).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10704      +/-   ##
==========================================
+ Coverage   88.44%   88.46%   +0.02%     
==========================================
  Files         330      330              
  Lines       44365    44367       +2     
==========================================
+ Hits        39237    39250      +13     
+ Misses       5128     5117      -11     

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