DM-46046: Update bps restart to work with relative path.

[MichelleGower]

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 97.91667% with 1 line in your changes missing coverage. Please review.

Project coverage is 57.41%. Comparing base (800e917) to head (56acb3e).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
python/lsst/ctrl/bps/htcondor/htcondor_service.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   55.95%   57.41%   +1.45%     
==========================================
  Files           8        8              
  Lines        2032     2078      +46     
  Branches      359      366       +7     
==========================================
+ Hits         1137     1193      +56     
+ Misses        857      843      -14     
- Partials       38       42       +4     

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