Fold country factor into location factor
Review app: https://fold-country-factor-into-location-factor.about-src.gitlab.com/job-families/engineering/backend-engineer/#compensation (example position)
Again, I used a script to calculate the new location factors. You can see that script, along with just the location factor changes, in d1ef72d0
Closes https://gitlab.com/gitlab-com/people-ops/General/issues/256.