[feature] add list_traits::repeat

[h-2]

There might be smarter ways to do this, but this does this job.

[vercel]

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[codecov]

Codecov Report

Merging #2899 (cf679de) into master (b30f4c7) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2899      +/-   ##
==========================================
- Coverage   98.28%   98.28%   -0.01%     
==========================================
  Files         266      266              
  Lines       11455    11455              
==========================================
- Hits        11259    11258       -1     
- Misses        196      197       +1     

Impacted Files	Coverage Δ
...de/seqan3/argument_parser/detail/version_check.hpp	93.12% <0.00%> (-0.77%)	⬇️

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[h-2]

Same thing here: why is coverage in arg parser reduced?