Make `check_outcome()` faster

[hfrick]

check_outcome() currently checks each element of a vector to be numeric for the regression mode or to be a factor for the classification mode but we only need it to check the vector.

parsnip/R/misc.R

Line 326 in 025cc59

if (!all(map_lgl(y, is.numeric))) {

and

parsnip/R/misc.R

Line 330 in 025cc59

if (!all(map_lgl(y, is.factor))) {

[github-actions]

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