Automatic gui version

[andrei-toterman]

Set the GUI version using the --build-name and --build-number args, using the MULTIPASS_VERSION CMake var. This way, we don't have to manually update the version all the time.
For the --build-number, the argument must only contain digits, so we extract the digits out of the commit hash respective to the current version.

MULTI-1702

[ricab]

Thank you @andrei-toterman!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.94%. Comparing base (11869d6) to head (0925844).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3806      +/-   ##
==========================================
- Coverage   88.95%   88.94%   -0.01%     
==========================================
  Files         256      256              
  Lines       14584    14584              
==========================================
- Hits        12973    12972       -1     
- Misses       1611     1612       +1     

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