slurm_scheduler: inherit cwd instead of image + skip mem request via cfg

[d4l3k]

This makes the slurm_scheduler inherit the local cwd instead of specifying chdir to the image to better match the behavior of local_cwd and the other schedulers. It also adds a nomem=true cfg option so you can avoid requesting memory on pcluster nodes

Fixes #371
Fixes #359

Test plan:

pytest torchx/schedulers/test/slurm_scheduler_test.py
scripts/slurmint.sh

CI

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[codecov]

Codecov Report

Merging #372 (1fc7974) into main (a53732d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #372   +/-   ##
=======================================
  Coverage   94.65%   94.66%           
=======================================
  Files          61       61           
  Lines        3202     3208    +6     
=======================================
+ Hits         3031     3037    +6     
  Misses        171      171           

Impacted Files	Coverage Δ
torchx/schedulers/slurm_scheduler.py	96.94% <100.00%> (+0.14%)	⬆️

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