[SPLTRP-1516]: Extend SelfIdentificationContextEnum with POSSESSIVE case and fix action titles grammar

[pedrazamiguez]

📝 Summary

💡 Motivation

🔗 Related Issues

Closes #1516

🧪 Testing Instructions

• I have tested these changes locally
• I have added/updated tests as needed
• All existing tests pass

📸 Screenshots (if applicable)

✅ Quality Checklist

• My code follows the project's coding standards
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have updated documentation as needed

[github-actions]

Test Results

3 302 tests  +4   3 302 ✅ +4   9m 49s ⏱️ -35s
  733 suites +2       0 💤 ±0 
  733 files   +2       0 ❌ ±0 

Results for commit ad1f293. ± Comparison against base commit b557713.

[github-actions]

❌ SonarQube Quality Gate Failed

The analysis completed but one or more quality gate conditions were not met.

🔍 View details on the SonarQube dashboard

Fix the reported issues and push again to re-trigger analysis.