Reorganize the script scil_bundle_label_map

[EmmaRenauld]

• Sent some parts into functions
• Added a lot of comments

@frheault , I still have a question. Can you check the todo at line 329?

[codecov]

Codecov Report

❌ Patch coverage is 72.97297% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.57%. Comparing base (0ba0902) to head (be15caf).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1288      +/-   ##
==========================================
+ Coverage   72.51%   72.57%   +0.05%     
==========================================
  Files         295      295              
  Lines       25442    25435       -7     
  Branches     3565     3557       -8     
==========================================
+ Hits        18449    18459      +10     
+ Misses       5488     5480       -8     
+ Partials     1505     1496       -9     

Flag	Coverage Δ
smoketests	69.77% <72.97%> (+0.05%)	⬆️
unittests	13.24% <1.35%> (+0.01%)	⬆️

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Components	Coverage Δ
Scripts	75.51% <79.41%> (+0.12%)	⬆️
Library	69.08% <67.50%> (+<0.01%)	⬆️

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