🛡️ Sentinel: [CRITICAL] Fix Argument Injection Vulnerability

[ManupaKDU]

🚨 Severity: CRITICAL
💡 Vulnerability: Argument injection risk in subprocess.Popen via unsanitized IP parameter.
🎯 Impact: Attackers could inject arbitrary arguments (like -h or other flags) to the ping command, leading to unexpected behavior.
🔧 Fix: Validated the IP address format strictly using the ipaddress module before passing it to subprocess.Popen.
✅ Verification: Run python3 -m unittest test_testping1.py to ensure invalid IPs are rejected and do not call subprocess.Popen.

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PR created automatically by Jules for task 10531295588525494265 started by @ManupaKDU

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