Updates to app run for Perlmutter

[cms21]

• I added an option to pass options to the command line through launch_params
• cpus-per-task is virtual cpus per task, i.e. threads on Perlmutter
• mem=40G seemed oddly specific, unclear why this was introduced. This can now be passed through launch_params if needed.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (bfbf833) 61.22% compared to head (0e25cd4) 61.19%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
- Coverage   61.22%   61.19%   -0.03%     
==========================================
  Files         157      157              
  Lines        9537     9541       +4     
  Branches     1232     1233       +1     
==========================================
  Hits         5839     5839              
- Misses       3440     3444       +4     
  Partials      258      258              

Impacted Files	Coverage Δ
balsam/platform/app_run/perlmutter.py	23.80% <0.00%> (-5.61%)	⬇️

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