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 33.20%. Comparing base (ac1fc74) to head (c6e0f40).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1468   +/-   ##
=======================================
  Coverage   33.20%   33.20%           
=======================================
  Files          22       22           
  Lines        3499     3499           
  Branches     3499     3499           
=======================================
  Hits         1162     1162           
  Misses       2332     2332           
  Partials        5        5           

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