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/chrome/1704f00f-79e6-43a7-961b-cedd3724d5fd.json

@@ -80,7 +80,6 @@
             "dropLocationName": "Zürich",
             "filterCriteria_carCategory": "large",
             "filterCriteria_sortBy": "PRICE"
-
           }
         }
       },
@@ -98,12 +97,13 @@
             "puYear": "{Year}",
             "doDay": "{DayD}",
             "doMonth": "{MonthD}",
-            "doYear":"{Year}"
+            "doYear": "{Year}"
           }
         }
       }
     ]
   },
   "proxy": true,
-  "possibility_of_env_change": "medium"
+  "possibility_of_env_change": "medium",
+  "fixed_ip": false
 }