RI-6959: Warn when overriding existing JSON key

[pawelangelow]

This PR introduces a confirmation dialog that appears when a JSON update would overwrite an existing key. It uses the existing utility from the desktop repo to check if the target path already exists. If so, the user is prompted to confirm or cancel the overwrite before the change is applied.

To test it, consider a few cases:

root-level change

{
  "a": 1
  "a": 2 <--- try to add this
}

nested-level change

{
 "a": { 
     "b": 1 
  }
 "a": { 
     "b": 2 <--- try to add this
  }
}

nested-level change for array structure

{
 "a": { 
     "b": [
        1,
        2,
        3
     ] 
  }
 "a": { 
     "b": [
        1,
        2,
        3,
        4 <--- try to add this
     ] 
  }
}

array type structure

[
  1,
  2,
  "test",
  { "a": 1 },
  3 <--- try to add this
]

and you can experiment with the type of values - number, string, boolean, array, object, etc..