DM-37552: Remove unnecessary lsstimport import

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Base: 83.14% // Head: 83.14% // No change to project coverage 👍

Coverage data is based on head (4251c88) compared to base (f3c9481).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #217    +/-   ##
========================================
  Coverage   83.14%   83.14%            
========================================
  Files          46       46            
  Lines        3982     3982            
  Branches      757      627   -130     
========================================
  Hits         3311     3311            
  Misses        485      485            
  Partials      186      186            

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