Fix array editing in the CLI

[SchoolGuy]

Currently if you try to edit some arrays we have in our datastructures this can lead to:

• Stacktraces in the CLI because of wrong access to the choosen data.
• Duplicates in the arrays because of missing Checks (Maybe we need to change the type to Set?)

[codecov[bot]]

Codecov Report

Merging #40 (8473284) into main (67c1e0d) will decrease coverage by 1.71%. The diff coverage is 22.03%.

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
- Coverage   48.32%   46.61%   -1.72%     
==========================================
  Files           6        6              
  Lines         716      753      +37     
==========================================
+ Hits          346      351       +5     
- Misses        370      402      +32     

Flag	Coverage Δ
unittests	46.61% <22.03%> (-1.72%)	:arrow_down:

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Impacted Files	Coverage Δ
libcobblersignatures/cli.py	0.00% <0.00%> (ø)
libcobblersignatures/utils.py	11.76% <33.33%> (-1.57%)	:arrow_down:
libcobblersignatures/models/osversion.py	79.91% <71.42%> (-0.60%)	:arrow_down:

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