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

❌ Patch coverage is 0% with 127 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.90%. Comparing base (d1ad908) to head (9a2b772).

Files with missing lines	Patch %	Lines
fact/src/host_scanner.rs	0.00%	117 Missing ⚠️
fact/src/event/mod.rs	0.00%	10 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #1468 +/- ##
==========================================
- Coverage 34.52% 33.90% -0.63% 
==========================================
Files 22 22 Lines 3325 3386 +61 Branches 3325 3386 +61 ==========================================
Hits 1148 1148 - Misses 2172 2233 +61 
Partials 5 5 

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