Revert "ci(common): sandbox Claude Code behind Squid proxy + iptables" (#2080)

Revert "ci(common): sandbox Claude Code behind Squid proxy + iptables (#2063)"

This reverts commit 9587546.

Author: immortal-tofu

.github/CODEOWNERS

@@ -18,7 +18,3 @@ test-suite/gateway-stress/Dockerfile @zama-ai/fhevm-devs
 
 # Coprocessor Team ownership
 /coprocessor/ @zama-ai/fhevm-coprocessor
-
-# Enforces changes in Sandboxed AI CI/CD
-.github/squid/sandbox-*.conf @zama-ai/infosec 
-.github/workflows/claude-*.yml @zama-ai/infosec