remove the duplicated entries of QARTOD variables under the ancillary_variables attributes

[leilabbb]

The ancillary_variables attribute under the variables being QCed is listing duplicates of QARTOD variables. See an example file following this datasets link: https://gliders.ioos.us/erddap/tabledap/ng309-20230820T0000.html

Here is a variable example:

temperature {
Float32 _FillValue -999.0;
Float32 actual_range 5.4466, 32.0449;
String ancillary_variables "temperature_qc qartod_temperature_flat_line_flag qartod_temperature_gross_range_flag qartod_temperature_rate_of_change_flag qartod_temperature_spike_flag qartod_temperature_primary_flag qartod_temperature_flat_line_flag qartod_temperature_gross_range_flag qartod_temperature_rate_of_change_flag qartod_temperature_spike_flag qartod_temperature_primary_flag qartod_temperature_flat_line_flag qartod_temperature_gross_range_flag qartod_temperature_rate_of_change_flag qartod_temperature_spike_flag qartod_temperature_primary_flag qartod_temperature_flat_line_flag qartod_temperature_gross_range_flag qartod_temperature_rate_of_change_flag qartod_temperature_spike_flag qartod_temperature_primary_flag";
Float64 colorBarMaximum 32.0;
Float64 colorBarMinimum 0.0;
String instrument "instrument_ctd";
String ioos_category "Temperature";
String long_name "Sea Water Temperature";
String observation_type "measured";
String platform "platform";
String standard_name "sea_water_temperature";
String units "degrees_C";
Float32 valid_max 40.0;
Float32 valid_min -5.0;
}

A quick ERDDAP searches show more than 200 datasets with similar issues:

174 datasets:
https://gliders.ioos.us/erddap/search/index.html?page=1&itemsPerPage=1000&searchFor=-delayed+qartod+%22qartod_density_flat_line_flag+qartod_density_gross_range_flag+qartod_density_rate_of_change_flag+qartod_density_spike_flag+qartod_density_primary_flag+qartod_density_flat_line_flag%22

86 datasets:
https://gliders.ioos.us/erddap/search/index.html?page=1&itemsPerPage=1000&searchFor=delayed+qartod+%22qartod_density_flat_line_flag+qartod_density_gross_range_flag+qartod_density_rate_of_change_flag+qartod_density_spike_flag+qartod_density_primary_flag+qartod_density_flat_line_flag%22

[benjwadams]

This may be a legacy issue -- I believe the underlying issue was fixed sometime back. Nonetheless, some of the existing metadata may need to be changed.

[sarinamann-noaa]

@leilabbb will link pull request and check ERDDAP to close the issue