Add --cores-per-node & --cpu-arch options to run sub-command

[douglatornell]

Replacement for --cedar-broadwell flag because we need to be able to specify cores/node
and CPU architecture for sockeye now too.

[codecov]

Codecov Report

Merging #18 (8e946e9) into main (74b9275) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   95.14%   95.15%   +0.01%     
==========================================
  Files          11       11              
  Lines        1297     1301       +4     
  Branches      166      166              
==========================================
+ Hits         1234     1238       +4     
  Misses         59       59              
  Partials        4        4              

Flag	Coverage Δ
unittests	95.15% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
salishsea_cmd/run.py	97.53% <100.00%> (-0.01%)	⬇️
tests/test_run.py	99.65% <100.00%> (+<0.01%)	⬆️

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[douglatornell]

Successfully tested by @SusanEAllen on sockeye.