NorESM - atmosrealm - missing time series files

In processing n1850GaxgGHG.LM.n30b24.511.betzy.20260904/atm - the following is now obtained using the code in PR #110

```
cmip7_prep.cmor_driver: No timeseries files found for variable albisccp_tavg-u-hxy-cl
cmip7_prep.cmor_driver: No timeseries files found for variable clcalipso_tavg-220hPa-hxy-air
cmip7_prep.cmor_driver: No timeseries files found for variable clcalipso_tavg-560hPa-hxy-air
cmip7_prep.cmor_driver: No timeseries files found for variable clcalipso_tavg-840hPa-hxy-air
cmip7_prep.cmor_driver: No timeseries files found for variable cltcalipso_tavg-u-hxy-u
cmip7_prep.cmor_driver: No timeseries files found for variable cltisccp_tavg-u-hxy-u
cmip7_prep.cmor_driver: No timeseries files found for variable co2mass_tavg-u-hm-u
cmip7_prep.cmor_driver: No timeseries files found for variable pctisccp_tavg-u-hxy-cl

cmip7_prep.pipeline: Skipping 'clisccp_tavg-p7c-hxy-air': no time series files found for source vars ['FISCCP1_COSP']
cmip7_prep.pipeline: Skipping 'co2_tavg-al-hxy-u' : no time series files found for source vars ['CO2']
cmip7_prep.pipeline: Skipping 'co2_tavg-p19-hxy-air' : no time series files found for source vars ['CO2']
cmip7_prep.pipeline: Skipping 'mc_tavg-alh-hxy-u' : no time series files found for source vars ['CMFMC', 'CMFMCDZM']
```