wekeo_ecmwf issue with SATELLITE_SEA_ICE_EDGE_TYPE

[sbrunato]

There is an issue when mapping region parameter during a search for SATELLITE_SEA_ICE_EDGE_TYPE on wekeo_ecmwf:

dag.search(
    provider="wekeo_ecmwf", 
    productType="SATELLITE_FIRE_BURNED_AREA", 
    start="2024-01-01", end="2024-01-02",
    raise_errors=True
)

  File "/home/sylvain/workspace/eodag/eodag/api/core.py", line 1218, in search
    search_results = self._do_search(
                     ^^^^^^^^^^^^^^^^
  File "/home/sylvain/workspace/eodag/eodag/api/core.py", line 1882, in _do_search
    res, nb_res = search_plugin.query(prep, **kwargs)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sylvain/workspace/eodag/eodag/plugins/search/qssearch.py", line 1654, in query
    qp, _ = self.build_query_string(product_type, **keywords)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sylvain/workspace/eodag/eodag/plugins/search/qssearch.py", line 916, in build_query_string
    query_params = format_query_params(product_type, self.config, kwargs)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sylvain/workspace/eodag/eodag/api/product/metadata_mapping.py", line 1306, in format_query_params
    orjson.loads(formatted_query_param),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
orjson.JSONDecodeError: unexpected character: line 1 column 15 (char 14)