text: Title: Add `on_limit_message` option to WHILE loops to control message used if loop limit is exceeded
  Body: Currently, the error raised when the limit of the WHILE loop is reached isn't customizable. As a result of the issue #4562, we decided to add an option named `on_limit_message` on the WHILE loop.
  
  Here is an example :
  
  ```
  *** Test Cases ***
  On limit message
      WHILE    True    limit=5    on_limit_message=Custom error message
          Log     Test
      END
  ```