Updated KGOs for freezing-rain to include a cell method

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No description provided.

[brhooper]

Summaries of the kgos for the acceptance tests using one hour and three hour data

One hour:

probability_of_lwe_thickness_of_freezing_rainfall_amount_above_threshold / (1) (lwe_thickness_of_freezing_rainfall_amount: 3; projection_y_coordinate: 49; projection_x_coordinate: 53)
    Dimension coordinates:
        lwe_thickness_of_freezing_rainfall_amount                                                                        x                           -                            -
        projection_y_coordinate                                                                                          -                           x                            -
        projection_x_coordinate                                                                                          -                           -                            x
    Scalar coordinates:
        forecast_period                                                        302400 seconds, bound=(298800, 302400) seconds
        forecast_reference_time                                                2021-02-10 18:00:00
        time                                                                   2021-02-14 06:00:00, bound=(2021-02-14 05:00:00, 2021-02-14 06:00:00)
    Cell methods:
        0                                                                      time: sum
    Attributes:
        Conventions                                                            'CF-1.7'
        institution                                                            'Met Office'
        mosg__model_configuration                                              'uk_ens'
        source                                                                 'Met Office Unified Model'
        title                                                                  'Post-Processed MOGREPS-UK Model Forecast on UK 2 km Standard Grid'

Three hour:

probability_of_lwe_thickness_of_freezing_rainfall_amount_above_threshold / (1) (lwe_thickness_of_freezing_rainfall_amount: 3; projection_y_coordinate: 49; projection_x_coordinate: 53)
    Dimension coordinates:
        lwe_thickness_of_freezing_rainfall_amount                                                                        x                           -                            -
        projection_y_coordinate                                                                                          -                           x                            -
        projection_x_coordinate                                                                                          -                           -                            x
    Scalar coordinates:
        forecast_period                                                        302400 seconds, bound=(291600, 302400) seconds
        forecast_reference_time                                                2021-02-10 18:00:00
        time                                                                   2021-02-14 06:00:00, bound=(2021-02-14 03:00:00, 2021-02-14 06:00:00)
    Cell methods:
        0                                                                      time: sum
    Attributes:
        Conventions                                                            'CF-1.7'
        institution                                                            'Met Office'
        mosg__model_configuration                                              'gl_ens'
        source                                                                 'Met Office Unified Model'
        title                                                                  'Post-Processed MOGREPS-G Forecast on UK 2 km Standard Grid'

Note that the new cell method is there, as expected.

[brhooper]

Plots of the data in the kgo files

One hour period data:

Three hour period data: