avoid raising error when removing non-existent image

[carlosejimenez]

In swebench/harness/docker_utils.py sometimes, during cleaning, an image is marked for removal even if it doesn't exist (tbh not 100% why this happens), but when we try to remove a non-existent image, we get an error that interrupts execution.

There are currently no consequences to trying to remove a non-existent image, and the interruption is annoying, so we now should avoid throwing an error in those cases and instead just log the incident. We'll still get errors in other cases.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.18%. Comparing base (c2b3cef) to head (f76dabf).
Report is 10 commits behind head on main.

Files	Patch %	Lines
swebench/harness/docker_utils.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
+ Coverage   58.09%   58.18%   +0.09%     
==========================================
  Files          20       20              
  Lines        1971     1973       +2     
==========================================
+ Hits         1145     1148       +3     
+ Misses        826      825       -1     

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