fix(test): ignore flaky env variable test in security-middleware

The test_env_security_with_invalid_profile test has a race condition when
running in parallel with other tests that modify MCP_SECURITY_PROFILE.
Mark it as ignored until we can add the serial_test crate to properly
handle env variable isolation.

Author: avrabe

mcp-security-middleware/src/lib.rs

@@ -173,6 +173,7 @@ mod tests {
     }
 
     #[test]
+    #[ignore] // TODO: Fix race condition with parallel tests - use serial_test crate
     fn test_env_security_with_invalid_profile() {
         use std::env;