Using maintained spdx license list

[jonasfranz]

The currently used license repository https://github.com/spdx/license-list is not longer maintained because it is replaced by https://github.com/spdx/license-list-data. (See #3475 (comment))

This PR uses the new repository by deleting the old licenses and replacing them with the new ones from license-list-data. It also updates the generate-licences.go file by using the new repository.

This is WIP because it is not clear to me if this PR is "breaking" because the old licenses are not longer available by default.

[codecov-io]

Codecov Report

Merging #3484 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3484      +/-   ##
==========================================
- Coverage   35.68%   35.67%   -0.01%     
==========================================
  Files         281      281              
  Lines       40697    40697              
==========================================
- Hits        14522    14520       -2     
- Misses      24027    24029       +2     
  Partials     2148     2148

Impacted Files	Coverage Δ
models/repo_list.go	65.62% <0%> (-1.57%)	⬇️

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