feat: standardize configuration fields across all evaluation examples

- Add `fixed_ip` field to all 369 JSON files in examples directory
  - Set to `true` for 8 files listed in google_chrome.json multi_apps
  - Set to `false` for remaining 361 files
- Add `possibility_of_env_change` field to 363 JSON files missing this field
  - Set to "low" for newly added fields
  - Preserve existing values (4 medium, 2 high) for 6 files that already had this field

This ensures consistent configuration schema across all evaluation examples
while maintaining backward compatibility with existing settings.

evaluation_examples/examples/multi_apps/3680a5ee-6870-426a-a997-eba929a0d25c.json

@@ -72,12 +72,18 @@
         ],
         "dest": [
           "output_gold.csv",
-          "output_gold2.csv", 
+          "output_gold2.csv",
           "output_gold3.csv"
         ],
-        "gives": [0, 1, 2]
+        "gives": [
+          0,
+          1,
+          2
+        ]
       }
     ]
   },
-  "proxy": false
+  "proxy": false,
+  "fixed_ip": false,
+  "possibility_of_env_change": "low"
 }