have empty test files for tests in extratests and extension packages

[EmilHvitfeldt]

We don't have any tests for bag_tree() because that model only works when {baguette} is also loaded. And it makes more sense to test these functions over there.

I think it would be useful, to still have a test file test_bag_tree.R in {parsnip} with the text.

test_that("testing", {
  # Testing is done in {baguette}
  # https://github.com/tidymodels/baguette

  expect_true(TRUE)
})

expect_true(TRUE) added to stop "skipping test files with no tests" message

[github-actions]

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