restrict fit_xy() from working for censored regression models
#445
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Closes #442
Models with the new mode "censored regression" can't use
fit_xy(), they should usefit().surv_regmodels have also been forced to use the formula interfacefit(). The check for that has been moved intofit_xy()fromcheck_xy_interface()which checks the details ofxandy. The corresponding tests forcheck_xy_interface()were removed. The tests for an error when usingfit_xy()with asurv_regmodel are untouched intest_sruv_reg_survreg.Randtest_surv_reg_flexsurv.R.The corresponding tests for models for censored regression are to be added when we have the corresponding model specs in parsnip (#444).