🛡️ Sentinel: [HIGH] Fix SSRF bypass via CGNAT addresses

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: Server-Side Request Forgery (SSRF) bypass via Carrier-Grade NAT (CGNAT) and other non-global IP ranges. The Python ipaddress module's is_private property evaluates CGNAT addresses (e.g., 100.64.0.0/10) as False, allowing them to bypass standard SSRF filters.
🎯 Impact: Attackers could potentially bypass SSRF protections to scan internal shared infrastructure if the hosting environment natively routes these non-public ranges.
🔧 Fix: Appended not getattr(ip, 'is_global', True) to the is_blocked logic for the primary IP and unwrapped IPv4/IPv6 addresses to safely block any non-global IPs while gracefully degrading on older Python versions.
✅ Verification: Added test_is_reachable_ssrf_cgnat_prevention unit test to test_testping1.py and ran the full test suite (python3 -m unittest test_testping1.py) successfully.

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PR created automatically by Jules for task 10266931522975799708 started by @ManupaKDU

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