misc: Remove decrepit singularity def file

[EdCaunt]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.97%. Comparing base (8ad5ec1) to head (70c32b4).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2860   +/-   ##
=======================================
  Coverage   78.96%   78.97%           
=======================================
  Files         248      248           
  Lines       51089    51089           
  Branches     4422     4422           
=======================================
+ Hits        40344    40348    +4     
+ Misses       9937     9934    -3     
+ Partials      808      807    -1     

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