[develop][fix] Add only if condition in the slurm munge key kitchen tests

[hehe7318]

Description of changes

• Fix the kitchen tests failed in AWS Batch

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.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (9e408e0) 76.06% compared to head (0b3f16f) 76.06%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2479   +/-   ##
========================================
  Coverage    76.06%   76.06%           
========================================
  Files           13       13           
  Lines         1876     1876           
========================================
  Hits          1427     1427           
  Misses         449      449           

Flag	Coverage Δ
unittests	76.06% <ø> (ø)

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