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[bot]]

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 :warning:
src/bookmarks/target_bookmarks.rs	87.83%	9 Missing :warning:

Additional details and impacted files

```diff @@ 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 ```

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