Update test sites

In NshmpSite enum:

• Remove duplicates from Alaska (keep Unalaska)
• Remove form regions and create separate ATC group
• Propagate updated site csv and geojsons to respective models

changed the description

assigned to @jaltekruse

@pmpowers - which version of the sites.csv and sites.geojson is official? nshmp-haz/etc/nshm/* or in the NSHMs (nshm-conus, nshm-alaska, nshm-hawaii), or the NshmpSite enum? It looks like, at least for CONUS, the nshm-conus sites file is newer than the version in nshmp-haz.

Official copies in NSHMs, changes should be made there and then migrated to nshmp-haz.

Official copies in nshmp-haz/etc/nshm as created by NshmpSiteFiles, migrate changes to nshms.

Adding nshm-conus sites specified in ghsc/nshmp/nshms/nshm-conus#57 (closed) (and the Hillsboro OR site previously added there)

marked the checklist item Remove duplicates from Alaska (keep Unalaska) as completed

mentioned in merge request !782 (merged)

mentioned in merge request ghsc/nshmp/nshms/nshm-alaska!70 (merged)

mentioned in merge request ghsc/nshmp/nshms/nshm-conus!118 (merged)

marked the checklist item Propagate updated site csv and geojsons to respective models as completed