Removes a currently scheduled messages.
Examples
if (FALSE) { # interactive()
# Schedule message
slack_posts_write("Testing delete msg", when = (Sys.Date() + lubridate::days(2)))
# Confirm scheduled
slack_scheduled_list()
# Remove message
slack_scheduled_list() |>
dplyr::filter(text == "Testing delete msg") |>
slack_scheduled_rm()
# Confirm that removed
slack_scheduled_list()
if (FALSE) { # \dontrun{
slack_scheduled_rm(channel = "#testing-api", id = "Q08U4S3J6QG")
} # }
}
