fix(cli): write CACHEDIR.TAG to log directories

[NickIAm]

Write a CACHEDIR.TAG file to the ~/.cache/kopia directory to exclude cli-logs and address #2822. Get the path to write the cachetag file by going up 1 level from the content cache where it was previously written.

[jkowalski]

can we write the marker to the logs directory directly instead of the parent?

The issue is that on Linux logs are under ~/.cache/kopia, which is kind of weird, on macOS we have dedicated directories for logs.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (dd1ebb1) 75.81% compared to head (2e2e21b) 75.40%.

❗ Current head 2e2e21b differs from pull request most recent head 381eb49. Consider uploading reports for the commit 381eb49 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3147      +/-   ##
==========================================
- Coverage   75.81%   75.40%   -0.41%     
==========================================
  Files         465      459       -6     
  Lines       37165    36343     -822     
==========================================
- Hits        28176    27404     -772     
+ Misses       7056     7024      -32     
+ Partials     1933     1915      -18     

Files	Coverage Δ
repo/format/format_blob_cache.go	82.95% <66.66%> (+0.39%)	⬆️

... and 100 files with indirect coverage changes

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[NickIAm]

Yeah I can change it. Didn't realize that logs are in a different directory on Mac, I don't have access to one.