[feature] Add skipped inventory entry tracking

[paul-fresquet]

Summary:

• Add runtime tracking of skipped inventory entries and their reasons.

Key changes:

• Introduce SkippedEntry and SkipReason models.
• Track skipped entries in InventoryProcessData and record skips during inventory building.
• Split noise vs system detection and update related unit tests.

Notes/risks:

• Build/test warnings exist in existing test projects.
• Skipped entries are runtime-only (not persisted).

[sonarqubecloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
87.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud