do not recurse into duplicate roots, fixes #5603 (master)

[ThomasWaldmann]

• do not archive duplicate roots (skip via inode)
• thus, it is also not extracted twice, avoiding issues

[codecov-io]

Codecov Report

Merging #5606 (73c0439) into master (2851a84) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5606      +/-   ##
==========================================
+ Coverage   82.99%   83.23%   +0.24%     
==========================================
  Files          38       38              
  Lines       10070    10119      +49     
  Branches     1671     1678       +7     
==========================================
+ Hits         8358     8423      +65     
+ Misses       1213     1199      -14     
+ Partials      499      497       -2     

Impacted Files	Coverage Δ
src/borg/archiver.py	80.36% <100.00%> (+0.46%)	⬆️
src/borg/helpers/datastruct.py	100.00% <0.00%> (ø)
src/borg/remote.py	79.55% <0.00%> (+0.35%)	⬆️
src/borg/archive.py	81.37% <0.00%> (+0.40%)	⬆️

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