Safe Transmute: Disable coinduction support

This patch just removes the `#[rustc_coinductive]` annotation from `BikeshedIntrinsicFrom` and flips the related tests to `check-fail`. Once an FCP for setting the annotation on the trait is approved, it could be enabled again.

Author: bryangarza

core/src/mem/transmutability.rs

@@ -5,7 +5,6 @@
 /// notwithstanding whatever safety checks you have asked the compiler to [`Assume`] are satisfied.
 #[unstable(feature = "transmutability", issue = "99571")]
 #[lang = "transmute_trait"]
-#[rustc_coinductive]
 pub unsafe trait BikeshedIntrinsicFrom<Src, Context, const ASSUME: Assume = { Assume::NOTHING }>
 where
     Src: ?Sized,