BE BUG fix: update openAPI specs of AIRMET for surface visiblity phenomenon

While testing https://gitlab.com/opengeoweb/opengeoweb/-/merge_requests/2081, I got an "Invalid request body" trying to save a draft of an Airmet with phenomenon surface visibility. This issue only occurred for this phenomenon. See if anything has changed and update the openapi specification.



AIRMET that caused the issue:
```
{
  "changeStatusTo": "DRAFT",
  "airmet": {
    "phenomenon": "SFC_VIS",
    "isObservationOrForecast": "OBS",
    "validDateStart": "2022-12-12T08:19:34Z",
    "validDateEnd": "2022-12-12T09:19:34Z",
    "locationIndicatorATSR": "EHAA",
    "locationIndicatorATSU": "EHAA",
    "locationIndicatorMWO": "EHDB",
    "firName": "AMSTERDAM FIR",
    "firGeometry": {
      "type": "FeatureCollection",
      "features": [
        {
          "type": "Feature",
          "geometry": {
            "type": "Polygon",
            "coordinates": [
              [
                [
                  5,
                  55
                ],
                [
                  4.331914,
                  55.332644
                ],
                [
                  3.368817,
                  55.764314
                ],
                [
                  2.761908,
                  54.379261
                ],
                [
                  3.15576,
                  52.913554
                ],
                [
                  2.000002,
                  51.500002
                ],
                [
                  3.370001,
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                ],
                [
                  3.370527,
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                ],
                [
                  3.362223,
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                ],
                [
                  3.36389,
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                ],
                [
                  3.373613,
                  51.309999
                ],
                [
                  3.952501,
                  51.214441
                ],
                [
                  4.397501,
                  51.452776
                ],
                [
                  5.078611,
                  51.391665
                ],
                [
                  5.848333,
                  51.139444
                ],
                [
                  5.651667,
                  50.824717
                ],
                [
                  6.011797,
                  50.757273
                ],
                [
                  5.934168,
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                ],
                [
                  6.222223,
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                ],
                [
                  5.94639,
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                ],
                [
                  6.405001,
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                ],
                [
                  7.053095,
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                ],
                [
                  7.031389,
                  52.268885
                ],
                [
                  7.063612,
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                ],
                [
                  7.065557,
                  52.385828
                ],
                [
                  7.133055,
                  52.888887
                ],
                [
                  7.14218,
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                ],
                [
                  7.191667,
                  53.3
                ],
                [
                  6.5,
                  53.666667
                ],
                [
                  6.500002,
                  55.000002
                ],
                [
                  5,
                  55
                ]
              ]
            ]
          },
          "properties": {
            "centlong": 4.98042633,
            "centlat": 52.8618788,
            "selectionType": "fir",
            "FIRname": "AMSTERDAM FIR",
            "StateName": "Netherlands",
            "StateCode": "NLD",
            "ICAOCODE": "EHAA",
            "REGION": "EUR"
          }
        }
      ]
    },
    "startGeometry": {
      "type": "FeatureCollection",
      "features": [
        {
          "type": "Feature",
          "properties": {
            "selectionType": "box",
            "stroke-opacity": 1,
            "_adaguctype": "box",
            "stroke-width": 1.5,
            "fill": "#f24a00",
            "stroke": "#f24a00",
            "fill-opacity": 0.25
          },
          "geometry": {
            "type": "Polygon",
            "coordinates": [
              [
                [
                  4.500970704201855,
                  49.495232525867735
                ],
                [
                  7.525278137937589,
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                ],
                [
                  7.525278137937589,
                  51.78280277916369
                ],
                [
                  4.500970704201855,
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                ],
                [
                  4.500970704201855,
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                ]
              ]
            ]
          }
        }
      ]
    },
    "startGeometryIntersect": {
      "type": "FeatureCollection",
      "features": [
        {
          "type": "Feature",
          "properties": {
            "stroke-opacity": 1,
            "stroke-width": 1.5,
            "fill": "#f24a00",
            "stroke": "#f24a00",
            "fill-opacity": 0.5
          },
          "geometry": {
            "type": "Polygon",
            "coordinates": [
              [
                [
                  4.500971,
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                ],
                [
                  5.078611,
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                ],
                [
                  5.848333,
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                ],
                [
                  5.651667,
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                ],
                [
                  6.011797,
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                ],
                [
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                ],
                [
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                ],
                [
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                ],
                [
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                ],
                [
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                ]
              ]
            ]
          }
        }
      ]
    },
    "movementType": "",
    "change": "",
    "sequence": "-1",
    "type": "NORMAL",
    "visibilityCause": "",
    "uuid": "8f6f5b14-79f1-11ed-899a-2ec4e9e487a3"
  }
}
```

Story points: 2.0