DM-20937 deprecated makeDistortedTanWcs as part of release v19. We can remove it as part of v20.
Do release 21.0.0 of science pipelines
Add deprecation warnings for to-be-removed distorted WCS functions
The warning that was added on DM-20937 says this code is “to be removed after v20”, not before. Will update blockers on this ticket appropriately.