ROX-33222: handle multiple hardlinks

[ovalenti]

Description

When files are tracked via their inode (host), we need to take into account that access may be done using a dentry (path) that is not the monitored one. Also, we need to adapt the kernel "monitored" inode life-cycle to verify if there are paths still monitored. The host_scanner model has to be updated to support several paths per inode.

Checklist

• Patch has a change log entry OR does not need one.
• Investigated and inspected CI test results
• Updated documentation accordingly

Automated testing

• Added unit tests
• Added integration tests
• Added regression tests

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.96%. Comparing base (d1ad908) to head (e92a6f1).
⚠️ Report is 42 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1468      +/-   ##
==========================================
- Coverage   34.52%   33.96%   -0.56%     
==========================================
  Files          22       22              
  Lines        3325     3421      +96     
  Branches     3325     3421      +96     
==========================================
+ Hits         1148     1162      +14     
- Misses       2172     2254      +82     
  Partials        5        5              

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