Report detected root licenses as a fallback in the SPDX `licenseDeclared` field

[sschuberth]

Please have a look at the individual commit messages for the details.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.67%. Comparing base (b43a41a) to head (f63243d). Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #9301   +/-   ##
=========================================
  Coverage     67.67%   67.67%           
  Complexity     1223     1223           
=========================================
  Files           244      244           
  Lines          8626     8626           
  Branches        911      911           
=========================================
  Hits           5838     5838           
  Misses         2413     2413           
  Partials        375      375           

Flag	Coverage Δ
funTest-docker	62.08% <ø> (ø)
funTest-non-docker	33.57% <ø> (ø)
test	37.00% <ø> (ø)

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[sschuberth]

@fviernau can we proceed with this? I'd really like to have the feature finally merged after 2 weeks.