[bugfix] Honor the systems.partitions.sched_options.max_sacct_failures configuration option for Slurm backends

[ekouts]

The issue was present since the original PR: #3418 .
Since the comparison was wrong, Reframe would actually crash from the first retry without any warning message.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.26%. Comparing base (26ffff0) to head (a9a90a8).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
reframe/core/schedulers/slurm.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3615      +/-   ##
==========================================
+ Coverage   91.25%   91.26%   +0.01%     
==========================================
  Files          62       62              
  Lines       13584    13584              
==========================================
+ Hits        12396    12398       +2     
+ Misses       1188     1186       -2     

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[vkarak]

@ekouts Could you add a description in the PR with the behaviour that this bug was incurring? This is for future reference and to be able to provide a more accurate description in the release notes.

[vkarak]

Lgtm, I've updated the title to be more descriptive.