throw error for single eval time in brier_survival_integrated()

[EmilHvitfeldt]

To close #460

library(censored)
library(yardstick)

lung_surv <- lung %>% 
  dplyr::mutate(surv = Surv(time, status), .keep = "unused")

cox <- proportional_hazards() %>% 
  fit(surv ~ ., data = lung_surv)

pred <- augment(cox, lung_surv, eval_time = 10)

brier_survival_integrated(
  data = pred,
  truth = surv,
  .pred
)
#> Error in `brier_survival_integrated()`:
#> ! At least 2 evaluation time is required. Only 1 unique time was given.

[hfrick]

I think the pluralization is overkill here :) The requirement is always "at least 2" and {num_eval_times} is not going to be 2 or more when we trigger that error.

[EmilHvitfeldt]

new and improved in #470

[hfrick]

this slightly off message is what caught my eye :)

[github-actions]

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