Auto merge of #113303 - compiler-errors:yeet-chalk, r=lcnr

Remove chalk support from the compiler

Removes chalk (`-Ztrait-solver=chalk`) from the compiler and prunes any dead code resulting from this, mainly:
* Remove the chalk compatibility layer in `compiler/rustc_traits/src/chalk`
* Remove the chalk flag `-Ztrait-solver=chalk` and its `TraitEngine` implementation
* Remove `TypeWellFormedFromEnv` (and its many `bug!()` match arms)
* Remove the chalk migration mode from compiletest
* Remove the `chalkify` UI tests (do we want to keep any of these, but migrate them to `-Ztrait-solver=next`??)

Fulfills rust-lang/types-team#93.

r? `@jackh726`

compiler/rustc_infer/src/infer/outlives/mod.rs

@@ -31,8 +31,7 @@ pub fn explicit_outlives_bounds<'tcx>(
             | ty::ClauseKind::Projection(_)
             | ty::ClauseKind::ConstArgHasType(_, _)
             | ty::ClauseKind::WellFormed(_)
-            | ty::ClauseKind::ConstEvaluatable(_)
-            | ty::ClauseKind::TypeWellFormedFromEnv(_) => None,
+            | ty::ClauseKind::ConstEvaluatable(_) => None,
         })
 }