Convert some tests from First to Get
Convert some tests from First to Get

In preparation of removing the Results/First functionality

FredericHeem/go-horizon,masonforest/go-horizon,masonforest/horizon,masonforest/go-horizon,lackac/horizon,lackac/horizon,nullstyle/go-horizon,nullstyle/go-horizon,masonforest/go-horizon,masonforest/horizon,stellar/horizon,masonforest/horizon,FredericHeem/go-horizon,irisli/horizon,FredericHeem/go-horizon,nullstyle/go-horizon,irisli/horizon,stellar/horizon,irisli/horizon,lackac/horizon,stellar/horizon