Relaxation of the "Step Units Rule"

[joobog]

https://jira.ecmwf.int/browse/ECC-1802

The updated rule permits simultaneous assignment of the same step unit to both 'stepUnits' and 'step*' keys, e.g., grib_set -s stepUnits=s,step=11s $in $temp

[github-actions]

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[github-actions]

Private downstream CI succeeded.
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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.53%. Comparing base (ca0c5f1) to head (6197097).

Files	Patch %	Lines
src/step.cc	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #218   +/-   ##
========================================
  Coverage    86.53%   86.53%           
========================================
  Files          786      786           
  Lines        62886    62888    +2     
  Branches     11070    11071    +1     
========================================
+ Hits         54416    54418    +2     
  Misses        8470     8470           

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