Add support for greedy-all-or-nothing

[EddyMM]

Description of changes

• Add support for greedy-all-or-nothing

Tests

• unit tests added
• manual tests on running cluster

References

n/a

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (67d32db) 89.98% compared to head (c226cad) 89.98%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #569   +/-   ##
========================================
  Coverage    89.98%   89.98%           
========================================
  Files           16       16           
  Lines         2706     2707    +1     
========================================
+ Hits          2435     2436    +1     
  Misses         271      271           

Flag	Coverage Δ
unittests	89.98% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
src/slurm_plugin/common.py	82.35% <100.00%> (+0.26%)	⬆️
src/slurm_plugin/instance_manager.py	100.00% <100.00%> (ø)

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