MAINT: Remove any promotion-state switching logic #27397
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Backport of #27156
This is the first level, no following code simplifications, just straight up deletions of any branching.
I kept a UserWarning, in case someone had the bad idea to permanently set the environment variable and think they can rely on it. Although would be happy to just delete that as well.
I think we can just do that, but maybe it's prudent to just point it out anyway...
DOC: Mention semi-private removed functions and tweak docs
Adress Marten's last comment