Bugfix: Looping LinSweepers

[samantha-ho]

This PR fixes a bug in the LinSweeper iterator which causes it to continually raise StopIteration when the iteration sequence has completed once. The bug prevents meausrement code from nesting LinSweeper objects by causing the inner loop to fail repeatedly once it has finished a single sweep.

The solution is to reset the internal iteration index to 0 before raising StopIteration. This allows a subsequent call to __next__ to start over at the beginning of the sweep.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.74%. Comparing base (3e2ce53) to head (0ffea17).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7607   +/-   ##
=======================================
  Coverage   59.74%   59.74%           
=======================================
  Files         351      351           
  Lines       31651    31652    +1     
=======================================
+ Hits        18909    18910    +1     
  Misses      12742    12742           

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