Update tidyselect syntax

[mfansler]

There is a warning omitted from the R scripts respecting using a vector to do column selection. This should be updated to preemptively avoid possible future support for the substandard syntax. For example:

Warning message:
Using an external vector in selections was deprecated in tidyselect 1.1.0.
ℹ Please use `all_of()` or `any_of()` instead.
  # Was:
  data %>% select(cols_to_rm)
  # Now:
  data %>% select(all_of(cols_to_rm))
See <https://tidyselect.r-lib.org/reference/faq-external-vector.html>.