Try sending notification for detected Excel photos

[teolemon]

Some producers are often doing tests and send screenshots of spreadsheets (when they are formulating a new product). Sending a slack notification when one of those is detected might help us spot such images.
https://static.openfoodfacts.org/images/products/325/039/288/3843/2.jpg

        {
          "mid": "/m/0hwky",
          "description": "Pattern",
          "score": 0.65681267,
          "topicality": 0.65681267
        },
        {
          "mid": "/m/030zfn",
          "description": "Parallel",
          "score": 0.5913635,
          "topicality": 0.5913635
        }