Avoid checking ScalingStrategy parameter at compile time

[NSsirena]

Description of changes

The recipe config_slurm_resume is processed also at compile time.
This causes failures since the value for the ScalingStrategy parameter is retrieved from the configuration that is available only at config time. By adding lazy we ensure that the parameter isn't checked at compile time.

• Avoid checking ScalingStrategy parameter at compile time.

Tests

• Manually validated by a peer launching a cluster.

References

• Original PR

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 (d754cf9) 76.06% compared to head (5a21ca6) 76.06%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2489   +/-   ##
========================================
  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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