Remove unused layers

[matamadio]

The following layers (all return periods) can be removed from TH.

Superceded: CF-EAF-GAR15 - https://www.geonode-gfdrrlab.org/layers/hazard%3Agar15_rp50_afr CF-EAS-GAR15 - https://www.geonode-gfdrrlab.org/layers/hazard%3Agar15_rp50_asi CF-NAM-GAR15 - https://www.geonode-gfdrrlab.org/layers/hazard%3Agar15_rp50_ame CF-PAC-GAR15 - https://www.geonode-gfdrrlab.org/layers/hazard%3Agar15_rp50_pac CF-SAS-GAR15 - https://www.geonode-gfdrrlab.org/layers/hazard%3Agar15_rp50_ind

Unused: EQ-US-USGS-1Hz - https://www.geonode-gfdrrlab.org/layers/hazard:_2014_1hz10pct50yrs EQ-US-USGS-5Hz - https://www.geonode-gfdrrlab.org/layers/hazard:_2014_5hz10pct50yrs EQ-US-USGS-PGA - https://www.geonode-gfdrrlab.org/layers/hazard:_2014_pga10pct50yrs FL-GLOBAL-FATHOM - https://www.geonode-gfdrrlab.org/layers/hazard:adm2_fu_v3_4bit TS-ID-GeoAus - https://www.geonode-gfdrrlab.org/layers/hazard%3Aindonesia_inland8km_rp500 UF-GLOBAL-FATHOM - https://www.geonode-gfdrrlab.org/layers/hazard:adm2_uu_v5_4bit DR-GLOBAL-PCR-GLOBWB - https://www.geonode-gfdrrlab.org/layers/hazard:rp_01000 EQ-GLOBAL-GAR15 - https://www.geonode-gfdrrlab.org/layers/hazard:pga_475y

[matamadio]

Hazard_type is used as flag to identify those layers that needs to be harvested.