Implement fixes and improvements

[quambene]

• Fix duplicate cache files for bogrep fetch --urls
• Fix report of processed bookmarks
• Take ignored urls into account in bogrep import
• Remove integration-test feature

[codecov]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (0a9db70) 90.20% compared to head (68880d8) 90.51%.

Files	Patch %	Lines
src/cmd/fetch.rs	64.00%	18 Missing ⚠️
src/bookmarks/target_bookmarks.rs	87.83%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   90.20%   90.51%   +0.30%     
==========================================
  Files          31       31              
  Lines        4432     4513      +81     
==========================================
+ Hits         3998     4085      +87     
+ Misses        434      428       -6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.