FIX: Fix issue 6719 get_string_version

[Alberto-DM]

Description

Changed the function get_string_version to be more robust and accept more input formats.
The old version would let pass random strings.
Added also extensive unit tests.
Finally, I separated the methods to check and normalize the user input from the internal check of the version format.

Issue linked

fix issue #6719

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.16%. Comparing base (038b1c0) to head (6100853).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6722       +/-   ##
===========================================
+ Coverage   28.07%   83.16%   +55.09%     
===========================================
  Files         245      245               
  Lines       77393    77404       +11     
===========================================
+ Hits        21729    64376    +42647     
+ Misses      55664    13028    -42636     

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