CMIP7: UKCM2: Investigate cubes missing coordinate "height2m"

[mo-laurenboon]

The following variables give the error "cube missing coordinate 'height2m'" when run using UKCM2. This should be investigated and corrected where possible.

Grid	Variable	Realm	Mapping Information
mip_convert_ap9_atmos-native	sfpm25_tavg-h2m-hxy-u	CMIP7_aerosol	237
mip_convert_ap9_atmos-native	sfpm10_tavg-h2m-hxy-u	CMIP7_aerosol	236
mip_convert_ap6_atmos-native	mmraerh2o_tavg-h2m-hxy-u	CMIP7_aerosol	206
mip_convert_ap6_atmos-native	mmrbc_tavg-h2m-hxy-u	CMIP7_aerosol	207
mip_convert_ap6_atmos-native	mmrdust_tavg-h2m-hxy-u	CMIP7_aerosol	208
mip_convert_ap6_atmos-native	mmroa_tavg-h2m-hxy-u	CMIP7_aerosol	211
mip_convert_ap6_atmos-native	mmrso4_tavg-h2m-hxy-u	CMIP7_aerosol	212
mip_convert_ap6_atmos-native	mmrss_tavg-h2m-hxy-u	CMIP7_aerosol	214
mip_convert_ap6_atmos-native	sfpm10_tavg-h2m-hxy-u	CMIP7_aerosol	218
mip_convert_ap6_atmos-native	sfpm25_tavg-h2m-hxy-u	CMIP7_aerosol	219
mip_convert_ap6_atmos-native	so2_tavg-h2m-hxy-u	CMIP7_aerosol	220