melodie-switch: Tests that can't yet test what they are supposed to test

[hfrick]

With https://github.com/tidymodels/tune/tree/melodie-switch:

Following on from #251, a lot of tests break because they can't create the tune_results object needed and thus can't even test the methods they are meant to test.

This affects
- tests/testthat/test-survival-tune-autoplot.R
- tests/testthat/test-survival-tune-case-weights.R
- tests/testthat/test-survival-augment.R
- tests/testthat/test-survival-tune-compute-metrics.R
- tests/testthat/test-survival-tune-select.R
- tests/testthat/test-survival-workflow-set-fit_best.R