DM-37140: Add rebase option to pipetask

[timj]

Checklist

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

[codecov]

Codecov Report

Patch coverage: 95.12% and project coverage change: +0.17% 🎉

Comparison is base (ba1d048) 87.03% compared to head (c3ca91e) 87.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #245      +/-   ##
==========================================
+ Coverage   87.03%   87.20%   +0.17%     
==========================================
  Files          47       47              
  Lines        4303     4337      +34     
  Branches      744      750       +6     
==========================================
+ Hits         3745     3782      +37     
+ Misses        402      400       -2     
+ Partials      156      155       -1     

Files Changed	Coverage Δ
python/lsst/ctrl/mpexec/cli/opt/optionGroups.py	100.00% <ø> (ø)
python/lsst/ctrl/mpexec/cli/script/qgraph.py	42.85% <ø> (ø)
python/lsst/ctrl/mpexec/cli/script/run.py	45.45% <ø> (ø)
python/lsst/ctrl/mpexec/cmdLineFwk.py	73.36% <88.23%> (+1.51%)	⬆️
python/lsst/ctrl/mpexec/cli/opt/options.py	87.50% <100.00%> (+0.17%)	⬆️
tests/test_cmdLineFwk.py	98.51% <100.00%> (+0.06%)	⬆️

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